Leadership Team

DION R. SAMERSON, MD, MBA, FACEP

Chief Executive Officer

Dr. Samerson is a South Florida native who earned a B.A. in Biochemistry & Molecular Biology from Boston University. He graduated from Ross University School of Medicine and completed his Emergency Medicine residency training at Wayne State University (Detroit Medical Center), Detroit, MI. In his final year of training, Dr. Samerson served as Chief Resident. He worked as an attending and Clinical Professor for one year at Wayne State University (Detroit Medical Center) before joining Excelis Medical Associates in 2009.

As a partner in the group and physician leader at St. Joseph’s Hospital, Dr. Samerson has served on several hospital and healthcare system committees. He was instrumental in developing a Type I Emergency Department Observation Unit at St. Joseph’s Hospital in 2015. Dr. Samerson was the Observation Unit Director prior to becoming the Emergency Department Medical Director and Department Chair for St. Joseph’s Hospital in 2018. In 2020, Excelis’ Board of Directors appointed Dr. Samerson to be the group’s Chief Executive Officer. Dr. Samerson holds a Master in Business Administration from the University of Florida, Warrington College of Business.

CHRIS M. ZARREKE, CPA, CGMA

Chief Administrative Officer

Chris is a Florida Certified Public Accountant and seasoned Senior Level Executive with more
than 30 years of professional experience. He began his career in Big 4 public accounting as an
auditor and consultant with PricewaterhouseCoopers before transitioning to private industry.
Prior to joining Excelis Medical Associates, Chris was a member of Senior Leadership Teams at
the VP/C-level across several industries including Healthcare, Metals, Paper, Food Distribution,
and Operations Consulting. His healthcare experience includes holding the position of CFO and
equity holder while at AnazaoHealth Corporation, a national specialty compounding pharmacy
as well as CFO of Medi-Weightloss, a national non-surgical medical weight management
franchise.

Additionally, Chris has been responsible for developing and maintaining relationships with key
clients and vendors integral to the success of the companies he has worked for and has been
heavily involved in strategic planning.

Chris is a Philadelphia native, but has lived and worked in Tampa, Florida since graduating from
college. He earned a Bachelor of Science in Accounting as well as a Masters of Accountancy
degree, both from Florida State University in Tallahassee, Florida. During his free time, Chris
enjoys the beach, playing tennis, collecting vintage toys & sports memorabilia and has been a
volunteer coach for youth athletics.

JAMES P. ROBELLI, MD, FACEP

President

Dr. Robelli grew up in Sterling Heights, Michigan and received his undergraduate degree in Physical Science from Michigan State University in East Lansing, Michigan. He then attended Wayne State University School of Medicine in Detroit, Michigan before moving to Orlando, Florida, where he completed his residency in emergency medicine at Orlando Regional Medical Center.

Prior to joining Excelis Medical Associates, Dr. Robelli was the Medical Director at Columbia Raulerson Hospital in Okeechobee, Florida and Vice-Director of the Emergency Department at St. Mary’s Hospital, West Palm Beach, Florida. He also served as Medical Director of Indian River Community College’s Paramedic program.

Dr. James Robelli has been with EMA since 1996. Throughout his tenure with the group, he has held several leadership positions including Director of Advance Practice Providers and Medical Director for St. Joseph’s Hospital – North. He has been a member of the EMA Board of Directors for over 10 years and served as group Treasurer. He currently serves as Medical Director of St. Joseph’s Hospital – South Emergency Department as well as President and Chairman of EMA’s Board of Directors.