About Us

Bob began his career with Picker International and worked his way up to manage both the sales and service organizations for the Midwest region. After decades of service to Picker, Bob decided to start his own venture, Cassling Diagnostic Imaging, in 1984. Through CDI, Bob wanted to focus on providing the absolute best in customer service from an initial inquiry all the way through long-term service of the customer’s needs. Focused regionally around Omaha, Nebraska, Bob had a particular interest in supporting rural healthcare. Bob grew the company through relationships with a number of different equipment vendors and adding customers through the excellent reputation the company developed. 

In 1996, Bob turned the presidency of CDI over to his son, Mike, but continued to guide CDI as its Chairman. Cassling grew to where it could diversify into other businesses and formed CQuence Health Group in 2011. Bob continued many great customer relationships up to his passing on Friday, July 25, 2014, at the age of 84.

When Bob Cassling passed away he left behind the legacy of a wise leader, a relationship builder, and the head of the family here at Cassling. Read about Bob’s vast influence from colleagues who worked with him for many years.

Read the Omaha World-Herald's story: H. Robert Cassling worked hard on relationships with family, friends and in business.

Ken Vetter worked for Bob Cassling for 20 years at Picker International before joining Cassling Diagnostic with him in 1984. As a 40 plus-year veteran of the healthcare industry, Ken served as vice president of Cassling Diagnostic Imaging until his retirement in 2008. Throughout his career with Cassling, Ken displayed a true understanding of the value of the customer relationship. His positive attitude and loyal actions helped lead the company to success. As one of Cassling’s senior leaders, he helped manage strategic initiatives to uncover new business and maintain strong customer relationships. Ken mentored new employees and ensured that Cassling maintained the highest moral and ethical standards.

Mike provides primary leadership as CEO of Cassling. He joined the team in 1985, working alongside his father and company founder, Bob Cassling. Mike worked in sales, serving as the vice president of sales and marketing, before being appointed president of the company in 1996.

In addition to his role with Cassling, Mike Cassling is CEO of CQuence Health Group, formed in 2011 to provide shared services and strategic direction for partner companie. Mike and CQuence Health Group also oversee a healthcare investment portfolio.

Under his leadership, Cassling and CQuence have earned multiple honors and awards, including:

• Modern Healthcare’s #1 ranked Best Places to Work in Healthcare (2015-2016)
• Modern Healthcare’s Best Places to Work in Healthcare (2013-2018)
• Gold Fit-Friendly Worksite by the American Heart Association (2016)
• Employee Voice Award, Quantum Workplace (2015)
• Gold Well Workplace Award by the Wellness Council of America (2014)
• Highest Actively Engaged Population and Highest Overall Job Satisfaction by Avatar Solutions (2012)
• Platinum Well Workplace Award by the Wellness Council of America (2011)
• Best Places to Work in Omaha (2011)
• Best Places to Work for the Advancement of Women (2011)
• HR Solutions Employee Engagement Awards, 1st place nationally (2010)
• Omaha Chamber of Commerce Business Excellence Award (2008)

Mike holds an undergraduate degree from the University of Nebraska-Lincoln in general accounting and marketing. He completed the Graduate School of Sales and Marketing at Syracuse University in 1992.

Mike is active in the Omaha community as an Aksarben Governor, Board Chair for the Omaha Community Foundation, and serving on the Board of Directors for The Salvation Army, Broadway Dreams Foundation, Nebraska Health Information Initiative and Omaha Performing Arts. He also serves on the Advisory Board for the Jeffrey S. Raikes School of Computer Science and Management at the University of Nebraska-Lincoln.

Nationally, he serves on the Broadway Dreams Executive Committee and is the Chair for The Salvation Army’s National Advisory Board. Mike is an Omaha “40 under 40” alumnus, was recognized in 2014 and 2010 with an Alumni Achievement Award from the University of Nebraska-Lincoln and is a Westside High School Hall of Fame honoree. Mike has two daughters, Megan and Kaila; his wife, Elizabeth, has two sons, Gage and JT.

Brian Walker received his Bachelor of Arts in Business Management at Washington State University.

Brian started his career with Cassling as an Account Executive on the West team serving customers in Washington, Oregon, and Idaho. He was hired into the territory in 2018 and has grown it into one of the most competitive territories across the country. Brian achieved President’s Club in 2 of his first 3 years at Cassling.

Prior to joining Cassling, Brian sold capital equipment for VasoHealthcare and GE. Being in healthcare for nearly 20 years, he also previously worked in the pharmaceutical and vaccine industries, before transitioning into medical equipment sales and management.

When Brian isn’t watching his 2 daughters play lacrosse and volleyball, he is spending his time on the golf course and cheering on his Washington State Cougs!

Steve Chambers graduated with Distinction from the University of Nebraska-Lincoln in 1986. He is a certified public accountant and joined Cassling in 1990. Prior to joining Cassling, he worked in public accounting at Deloitte and Touche. He serves as the Chief Financial Officer for CQuence operated companies and is involved in finance and investing decisions of CQuence Health Group.

Steve is active in the community. He has in the past served as treasurer of the Teammates Metro Omaha Board and treasurer of a large youth soccer club. He currently is a Teammates mentor and is on the Millard Teammates Board of Directors. Steve also is a member of the Nebraska Society of Certified Public Accountants.

Kyle Salem joined Cassling in February 2005 and was named President in 2017. Dr. Salem earned his doctorate in biomedical engineering from Case Western Reserve University and has completed the Kellogg Management Institute at the Kellogg School of Management at Northwestern University.

After his time in academia, he initially worked for Siemens Medical Solutions MRI research & development, serving as the primary scientist supporting their second 3 Tesla MRI scanner in the U.S. He also managed U.S. R&D MRI collaborations for two years.

In 2005, Kyle joined Cassling Diagnostic Imaging where he has held a number of roles from strategic sales executive to vice president of corporate strategy and development. Today, as president, Kyle strengthens community healthcare by working with customers to ensure Cassling's offerings meet their short- and long-term goals, as well as clinical, financial and organizational needs.

Carol Armitage earned her degree in business administration from the University of Nebraska-Lincoln in 2001, with an emphasis in both finance and accounting.  In 2008, Carol joined the Cassling team with more than a decade of management and operational experience in various industries.  She began her career with Cassling by managing the service and contract billing teams before being promoted to the Service Operations Manager and then the Director of Service Operations.  Currently, Carol leads the operational teams for sales, service, business analytics and compliance in her role of VP of Operations.

Carol is also an active member of the community. She has been a Teammates mentor since 2009 and also donates her time to a variety of animal rescue groups in the Omaha-metro area. Carol currently serves on the American Heart Association’s Executive Leadership Team, where she works to increase awareness of cardiovascular disease, the leading cause of death in women of all ages.

Joe began his career at Cassling in 1985 as a Field Service Engineer and Project Manager, where he installed and serviced various types of imaging equipment throughout our Midwest region. Over the years, Joe has held various leadership roles within the Cassling service team, including Regional Service Manager.

Today, as Vice President of Service, Joe leads the entire equipment implementation and service teams while also working with customers to develop customized service solutions.

Randy Wobig is Chief Information Officer for CQuence Health Group and its partner company, Cassling, a diagnostic medical equipment and services company. In his role, Randy oversees all corporate information technology, as well as facility planning and management, for the organization.

Randy joined Cassling, one of CQuence’s partner companies in 1999 as a Clinical Network Specialist. He was promoted to Director, Clinical Applications, and later to Vice President of Services, where he managed Cassling’s applications support, PACS service support, and project managers. Randy transitioned to the role of Chief Information Officer in January of 2010.

Before joining the Cassling team, Randy spent 14 years gaining hands-on diagnostic imaging and digital imaging systems management experience at Nebraska Medicine (formerly Nebraska Health Systems). He had eight years of experience working with the Hospital and Radiology Information Systems (HIS/RIS) teams. Randy also held a courtesy faculty appointment for teaching in the College of Allied Health Professions.

Randy is a graduate of UNMC’s College of Allied Health Professions with an associate’s degree in radiography and a bachelor’s degree in diagnostic medical sonography. He also served as a founding member and Vice President of the UNMC Radiation Science Technology Education Alumni Chapter. He continues to be active in the UNMC College of Allied Health Alumni Association.

BBruce Stec is Vice President of People and Culture for CQuence Health Group and its partner company, Cassling, a diagnostic medical equipment and services company. Bruce is responsible for aligning organizational goals and objectives with human resource programs and projects to ensure a unified culture throughout all CQuence partner companies.

Bruce joined CQuence in 2013 with nearly 20 years of human resources management and consulting experience. At CQuence, Bruce has implemented innovative performance management tools and the company’s first-ever formal leadership development program. Under Bruce’s leadership, CQuence has been recognized locally, regionally and nationally for its award-winning workplace culture and wellness programs. The organization has been ranked in the top 10 of Modern Healthcare’s Best Places to Work in Healthcare for four straight years.

Bruce graduated from the University of Nebraska at Kearney and has earned both his Senior Professional in Human Resources (SPHR®) certification and his Society for Human Resource Management Senior Certified Professional (SHRM-SCP) certification. He was named SHRM Nebraska’s Human Resource Professional of the Year in 2015.

He contributes his time and talent as a board member for several local organizations, including the Human Resource Association of the Midlands and CASA for Douglas County.

Elizabeth Grieger joined Cassling in 2006. In her current role, she is responsible for developing and managing relationships with Cassling’s strategic accounts, including IDNs, GPOs, regional purchasing networks and health systems. She also oversees Cassling’s clinical strategy team, as well as its clinical solution set, which include equipment service sales and ultrasound products. Since starting at Cassling, Elizabeth has held a number of roles focused on customer relationship building, from Product Sales Executive for cardiology IT solutions and most recently as Strategic Accounts Manager. 

Prior to Cassling, Elizabeth worked as a Registered Nurse in hospitals throughout Eastern Nebraska. She earned her Bachelor’s of Science in Nursing from the University of Nebraska Medical Center College of Nursing in Omaha, Nebraska.

Kim Phox is Regional Vice President at Cassling, overseeing the sales division in the company’s Midwest region. She got her start at Cassling nearly 15 years ago as an account executive in Kansas. Kim then oversaw Cassling’s expansion into its South territory, achieving great success in navigating the freestanding emergency room business and helping organizations be successful in a rapidly changing healthcare environment. Kim is passionate about healthcare and believes in doing the right thing in an industry that has to control costs and improve patient care and outcomes. Prior to starting at Cassling in 2004, she worked as a high school math and science teacher.

Kim’s experience as a former teacher makes her a great coach and a natural leader. For example, she teaches Crown Ministries Finance and volunteers with her husband at their church and for Young Life, a national religious organization committed to helping adolescents grow in their faith.

Kim received a Bachelor’s of Science in Biology, as well as a Master’s in Science Education from Friends University. She is an avid fan of the North Carolina Tarheels, but an even bigger fan of her grandkids.

Amy Reid is Cassling’s Regional Vice President of Surgery, leading a team of surgery and urology Product Sales Executives throughout the Midwest.  
 
Amy began her career in healthcare as a Nurse Manager in the Operation Room. In 1998, Amy made the transition into medical sales. She spent the past 18 years working for Olympus America, Inc. first as a Territory Manager, then a Field Sales Trainer, and ultimately as a Regional Vice President where she oversaw a sales team across 13 states in the Midwest.  
Amy puts a positive customer experience at the forefront of all she does. She is passionate about building partnerships that ultimately benefit the patients Cassling customers serve. 
 
Amy received her bachelor’s degree in healthcare administration and marketing at Wichita State University. Outside of her time leading Cassling’s surgery team, Amy enjoys spending time with her family including 4 grandchildren, exercising and traveling to warm, sandy destinations.

Mark Miller has served the healthcare industry for 20 years. In his current role as the Vice President of Sales, Mark leads Cassling's Account Executive team throughout the Midwest, West and South territories.

He started his career with a degree in Cardiopulmonary Science from LSU, and worked for five years in the clinical setting, including the cath lab, echocardiography and respiratory therapy departments. Mark has spent the last 15 years leveraging his clinical experience in sales and sales leadership roles in the interventional and diagnostic imaging space.

Outside of his career in healthcare, Mark is active in several wetland conservation and watershed improvement projects with the Natural Resources Conservation Service in drought-susceptible areas of North East Texas.

Gavin Winter is a Regional Vice President at Cassling, overseeing the sales division of the company’s South region. Gavin joined Cassling in 2016, working as an Account Executive in San Francisco before transferring to a similar role in Austin, Texas. In his current position, Gavin is dedicated to ensuring customers are able to find the best imaging equipment fit for their organization and patients.

Gavin is a graduate of San Diego State University, where he earned his bachelor’s degree in business management. Prior to joining Cassling, Gavin sold total joint replacements at DePuy Orthopaedics. An avid sports fan, he also previously worked for professional teams, including the San Diego Padres and the Cleveland Cavaliers, before transitioning into medical equipment sales and management.

Tana Phelps is the Vice President of Marketing for CQuence Health Group and its partner company, Cassling, a customer-centric imaging and therapeutic technology, services and solutions company. Tana is responsible for managing the strategy, planning, growth and development of marketing for all CQuence partner companies and business units.

Tana brought her passion for healthcare to CQuence in 2011. Her marketing experience includes work in diagnostic imaging, healthcare IT, concierge medicine, telehealth, cardiology and more. She has executed customized marketing campaigns on behalf of hundreds of hospitals and clinics throughout the country, gaining great insights into consumer and physician audience behavior.

Under Tana’s leadership, CQuence and Cassling launched a 2030 plan to impact more than 1 billion patient lives. In 2021, she was honored with the Bob Cassling Service Excellence Award for exemplifying the company’s cultural beliefs and commitment to customer service.

Prior to joining CQuence, Tana was communications manager at NRC Health, a national patient satisfaction survey vendor and research organization. Tana is a published blogger and author—with features in Midwest Medical Edition magazine. She studied journalism, marketing and advertising at the University of Nebraska Lincoln, and earned a Certificate of Excellence in Business through the Carlson School of Management at the University of Minnesota. She enjoys spending her free time with her husband and three kids, running and volunteering.

Bob began his career with Picker International and worked his way up to manage both the sales and service organizations for the Midwest region. After decades of service to Picker, Bob decided to start his own venture, Cassling Diagnostic Imaging, in 1984. Through CDI, Bob wanted to focus on providing the absolute best in customer service from an initial inquiry all the way through long-term service of the customer’s needs. Focused regionally around Omaha, Nebraska, Bob had a particular interest in supporting rural healthcare. Bob grew the company through relationships with a number of different equipment vendors and adding customers through the excellent reputation the company developed. 

In 1996, Bob turned the presidency of CDI over to his son, Mike, but continued to guide CDI as its Chairman. Cassling grew to where it could diversify into other businesses and formed CQuence Health Group in 2011. Bob continued many great customer relationships up to his passing on Friday, July 25, 2014, at the age of 84.

When Bob Cassling passed away he left behind the legacy of a wise leader, a relationship builder, and the head of the family here at Cassling. Read about Bob’s vast influence from colleagues who worked with him for many years.

Read the Omaha World-Herald's story: H. Robert Cassling worked hard on relationships with family, friends and in business.

Ken Vetter worked for Bob Cassling for 20 years at Picker International before joining Cassling Diagnostic with him in 1984. As a 40 plus-year veteran of the healthcare industry, Ken served as vice president of Cassling Diagnostic Imaging until his retirement in 2008. Throughout his career with Cassling, Ken displayed a true understanding of the value of the customer relationship. His positive attitude and loyal actions helped lead the company to success. As one of Cassling’s senior leaders, he helped manage strategic initiatives to uncover new business and maintain strong customer relationships. Ken mentored new employees and ensured that Cassling maintained the highest moral and ethical standards.

Mike provides primary leadership as CEO of Cassling. He joined the team in 1985, working alongside his father and company founder, Bob Cassling. Mike worked in sales, serving as the vice president of sales and marketing, before being appointed president of the company in 1996.

In addition to his role with Cassling, Mike Cassling is CEO of CQuence Health Group, formed in 2011 to provide shared services and strategic direction for partner companie. Mike and CQuence Health Group also oversee a healthcare investment portfolio.

Under his leadership, Cassling and CQuence have earned multiple honors and awards, including:

• Modern Healthcare’s #1 ranked Best Places to Work in Healthcare (2015-2016)
• Modern Healthcare’s Best Places to Work in Healthcare (2013-2018)
• Gold Fit-Friendly Worksite by the American Heart Association (2016)
• Employee Voice Award, Quantum Workplace (2015)
• Gold Well Workplace Award by the Wellness Council of America (2014)
• Highest Actively Engaged Population and Highest Overall Job Satisfaction by Avatar Solutions (2012)
• Platinum Well Workplace Award by the Wellness Council of America (2011)
• Best Places to Work in Omaha (2011)
• Best Places to Work for the Advancement of Women (2011)
• HR Solutions Employee Engagement Awards, 1st place nationally (2010)
• Omaha Chamber of Commerce Business Excellence Award (2008)

Mike holds an undergraduate degree from the University of Nebraska-Lincoln in general accounting and marketing. He completed the Graduate School of Sales and Marketing at Syracuse University in 1992.

Mike is active in the Omaha community as an Aksarben Governor, Board Chair for the Omaha Community Foundation, and serving on the Board of Directors for The Salvation Army, Broadway Dreams Foundation, Nebraska Health Information Initiative and Omaha Performing Arts. He also serves on the Advisory Board for the Jeffrey S. Raikes School of Computer Science and Management at the University of Nebraska-Lincoln.

Nationally, he serves on the Broadway Dreams Executive Committee and is the Chair for The Salvation Army’s National Advisory Board. Mike is an Omaha “40 under 40” alumnus, was recognized in 2014 and 2010 with an Alumni Achievement Award from the University of Nebraska-Lincoln and is a Westside High School Hall of Fame honoree. Mike has two daughters, Megan and Kaila; his wife, Elizabeth, has two sons, Gage and JT.

Brian Walker received his Bachelor of Arts in Business Management at Washington State University.

Brian started his career with Cassling as an Account Executive on the West team serving customers in Washington, Oregon, and Idaho. He was hired into the territory in 2018 and has grown it into one of the most competitive territories across the country. Brian achieved President’s Club in 2 of his first 3 years at Cassling.

Prior to joining Cassling, Brian sold capital equipment for VasoHealthcare and GE. Being in healthcare for nearly 20 years, he also previously worked in the pharmaceutical and vaccine industries, before transitioning into medical equipment sales and management.

When Brian isn’t watching his 2 daughters play lacrosse and volleyball, he is spending his time on the golf course and cheering on his Washington State Cougs!

Steve Chambers graduated with Distinction from the University of Nebraska-Lincoln in 1986. He is a certified public accountant and joined Cassling in 1990. Prior to joining Cassling, he worked in public accounting at Deloitte and Touche. He serves as the Chief Financial Officer for CQuence operated companies and is involved in finance and investing decisions of CQuence Health Group.

Steve is active in the community. He has in the past served as treasurer of the Teammates Metro Omaha Board and treasurer of a large youth soccer club. He currently is a Teammates mentor and is on the Millard Teammates Board of Directors. Steve also is a member of the Nebraska Society of Certified Public Accountants.

Kyle Salem joined Cassling in February 2005 and was named President in 2017. Dr. Salem earned his doctorate in biomedical engineering from Case Western Reserve University and has completed the Kellogg Management Institute at the Kellogg School of Management at Northwestern University.

After his time in academia, he initially worked for Siemens Medical Solutions MRI research & development, serving as the primary scientist supporting their second 3 Tesla MRI scanner in the U.S. He also managed U.S. R&D MRI collaborations for two years.

In 2005, Kyle joined Cassling Diagnostic Imaging where he has held a number of roles from strategic sales executive to vice president of corporate strategy and development. Today, as president, Kyle strengthens community healthcare by working with customers to ensure Cassling's offerings meet their short- and long-term goals, as well as clinical, financial and organizational needs.

Carol Armitage earned her degree in business administration from the University of Nebraska-Lincoln in 2001, with an emphasis in both finance and accounting.  In 2008, Carol joined the Cassling team with more than a decade of management and operational experience in various industries.  She began her career with Cassling by managing the service and contract billing teams before being promoted to the Service Operations Manager and then the Director of Service Operations.  Currently, Carol leads the operational teams for sales, service, business analytics and compliance in her role of VP of Operations.

Carol is also an active member of the community. She has been a Teammates mentor since 2009 and also donates her time to a variety of animal rescue groups in the Omaha-metro area. Carol currently serves on the American Heart Association’s Executive Leadership Team, where she works to increase awareness of cardiovascular disease, the leading cause of death in women of all ages.

Joe began his career at Cassling in 1985 as a Field Service Engineer and Project Manager, where he installed and serviced various types of imaging equipment throughout our Midwest region. Over the years, Joe has held various leadership roles within the Cassling service team, including Regional Service Manager.

Today, as Vice President of Service, Joe leads the entire equipment implementation and service teams while also working with customers to develop customized service solutions.

Randy Wobig is Chief Information Officer for CQuence Health Group and its partner company, Cassling, a diagnostic medical equipment and services company. In his role, Randy oversees all corporate information technology, as well as facility planning and management, for the organization.

Randy joined Cassling, one of CQuence’s partner companies in 1999 as a Clinical Network Specialist. He was promoted to Director, Clinical Applications, and later to Vice President of Services, where he managed Cassling’s applications support, PACS service support, and project managers. Randy transitioned to the role of Chief Information Officer in January of 2010.

Before joining the Cassling team, Randy spent 14 years gaining hands-on diagnostic imaging and digital imaging systems management experience at Nebraska Medicine (formerly Nebraska Health Systems). He had eight years of experience working with the Hospital and Radiology Information Systems (HIS/RIS) teams. Randy also held a courtesy faculty appointment for teaching in the College of Allied Health Professions.

Randy is a graduate of UNMC’s College of Allied Health Professions with an associate’s degree in radiography and a bachelor’s degree in diagnostic medical sonography. He also served as a founding member and Vice President of the UNMC Radiation Science Technology Education Alumni Chapter. He continues to be active in the UNMC College of Allied Health Alumni Association.

BBruce Stec is Vice President of People and Culture for CQuence Health Group and its partner company, Cassling, a diagnostic medical equipment and services company. Bruce is responsible for aligning organizational goals and objectives with human resource programs and projects to ensure a unified culture throughout all CQuence partner companies.

Bruce joined CQuence in 2013 with nearly 20 years of human resources management and consulting experience. At CQuence, Bruce has implemented innovative performance management tools and the company’s first-ever formal leadership development program. Under Bruce’s leadership, CQuence has been recognized locally, regionally and nationally for its award-winning workplace culture and wellness programs. The organization has been ranked in the top 10 of Modern Healthcare’s Best Places to Work in Healthcare for four straight years.

Bruce graduated from the University of Nebraska at Kearney and has earned both his Senior Professional in Human Resources (SPHR®) certification and his Society for Human Resource Management Senior Certified Professional (SHRM-SCP) certification. He was named SHRM Nebraska’s Human Resource Professional of the Year in 2015.

He contributes his time and talent as a board member for several local organizations, including the Human Resource Association of the Midlands and CASA for Douglas County.

Elizabeth Grieger joined Cassling in 2006. In her current role, she is responsible for developing and managing relationships with Cassling’s strategic accounts, including IDNs, GPOs, regional purchasing networks and health systems. She also oversees Cassling’s clinical strategy team, as well as its clinical solution set, which include equipment service sales and ultrasound products. Since starting at Cassling, Elizabeth has held a number of roles focused on customer relationship building, from Product Sales Executive for cardiology IT solutions and most recently as Strategic Accounts Manager. 

Prior to Cassling, Elizabeth worked as a Registered Nurse in hospitals throughout Eastern Nebraska. She earned her Bachelor’s of Science in Nursing from the University of Nebraska Medical Center College of Nursing in Omaha, Nebraska.

Kim Phox is Regional Vice President at Cassling, overseeing the sales division in the company’s Midwest region. She got her start at Cassling nearly 15 years ago as an account executive in Kansas. Kim then oversaw Cassling’s expansion into its South territory, achieving great success in navigating the freestanding emergency room business and helping organizations be successful in a rapidly changing healthcare environment. Kim is passionate about healthcare and believes in doing the right thing in an industry that has to control costs and improve patient care and outcomes. Prior to starting at Cassling in 2004, she worked as a high school math and science teacher.

Kim’s experience as a former teacher makes her a great coach and a natural leader. For example, she teaches Crown Ministries Finance and volunteers with her husband at their church and for Young Life, a national religious organization committed to helping adolescents grow in their faith.

Kim received a Bachelor’s of Science in Biology, as well as a Master’s in Science Education from Friends University. She is an avid fan of the North Carolina Tarheels, but an even bigger fan of her grandkids.

Amy Reid is Cassling’s Regional Vice President of Surgery, leading a team of surgery and urology Product Sales Executives throughout the Midwest.  
 
Amy began her career in healthcare as a Nurse Manager in the Operation Room. In 1998, Amy made the transition into medical sales. She spent the past 18 years working for Olympus America, Inc. first as a Territory Manager, then a Field Sales Trainer, and ultimately as a Regional Vice President where she oversaw a sales team across 13 states in the Midwest.  
Amy puts a positive customer experience at the forefront of all she does. She is passionate about building partnerships that ultimately benefit the patients Cassling customers serve. 
 
Amy received her bachelor’s degree in healthcare administration and marketing at Wichita State University. Outside of her time leading Cassling’s surgery team, Amy enjoys spending time with her family including 4 grandchildren, exercising and traveling to warm, sandy destinations.

Mark Miller has served the healthcare industry for 20 years. In his current role as the Vice President of Sales, Mark leads Cassling's Account Executive team throughout the Midwest, West and South territories.

He started his career with a degree in Cardiopulmonary Science from LSU, and worked for five years in the clinical setting, including the cath lab, echocardiography and respiratory therapy departments. Mark has spent the last 15 years leveraging his clinical experience in sales and sales leadership roles in the interventional and diagnostic imaging space.

Outside of his career in healthcare, Mark is active in several wetland conservation and watershed improvement projects with the Natural Resources Conservation Service in drought-susceptible areas of North East Texas.

Gavin Winter is a Regional Vice President at Cassling, overseeing the sales division of the company’s South region. Gavin joined Cassling in 2016, working as an Account Executive in San Francisco before transferring to a similar role in Austin, Texas. In his current position, Gavin is dedicated to ensuring customers are able to find the best imaging equipment fit for their organization and patients.

Gavin is a graduate of San Diego State University, where he earned his bachelor’s degree in business management. Prior to joining Cassling, Gavin sold total joint replacements at DePuy Orthopaedics. An avid sports fan, he also previously worked for professional teams, including the San Diego Padres and the Cleveland Cavaliers, before transitioning into medical equipment sales and management.

Tana Phelps is the Vice President of Marketing for CQuence Health Group and its partner company, Cassling, a customer-centric imaging and therapeutic technology, services and solutions company. Tana is responsible for managing the strategy, planning, growth and development of marketing for all CQuence partner companies and business units.

Tana brought her passion for healthcare to CQuence in 2011. Her marketing experience includes work in diagnostic imaging, healthcare IT, concierge medicine, telehealth, cardiology and more. She has executed customized marketing campaigns on behalf of hundreds of hospitals and clinics throughout the country, gaining great insights into consumer and physician audience behavior.

Under Tana’s leadership, CQuence and Cassling launched a 2030 plan to impact more than 1 billion patient lives. In 2021, she was honored with the Bob Cassling Service Excellence Award for exemplifying the company’s cultural beliefs and commitment to customer service.

Prior to joining CQuence, Tana was communications manager at NRC Health, a national patient satisfaction survey vendor and research organization. Tana is a published blogger and author—with features in Midwest Medical Edition magazine. She studied journalism, marketing and advertising at the University of Nebraska Lincoln, and earned a Certificate of Excellence in Business through the Carlson School of Management at the University of Minnesota. She enjoys spending her free time with her husband and three kids, running and volunteering.