Our Team

Robert Devrnja, MD, FACFE

Dr. Devrnja is a graduate of University of Guadalajara (UAG) with his postdoctoral training at Allegheny General Hospital in Pittsburgh. He completed a research fellowship at the University of Alabama in Birmingham and attended the University of Tennessee’s (PEMBA) Physician Executive MBA program in Knoxville, TN. He has practiced Emergency Medicine since 1984, and is the founder of two successful emergency medicine companies. Dr. Devrnja is a Fellow of the American College of Forensic Examiners and is also the Secretary of the Rural Health Section of the American College of Emergency Physicians (ACEP).




Mike Wheelis, MD

Dr. Michael Wheelis, a graduate of Louisiana State University School of Medicine in New Orleans, is board certified in Emergency Medicine, and is a Fellow with the American College of Emergency Physicians. Dr. Wheelis joined the ERx team in February 2016 as Regional Director of the Southern Region of the US, and Director of Physician Education. Through instructional teleconferences as well as individual education, he assists our physicians with documentation improvement, compliance and the ever changing CMS regulations and requirements. In addition to the work he does with ERx, Dr. Wheelis holds active memberships with the American College of Physicians, American College of Emergency Physicians, Southern Medical Association, Orleans Parish Medical Society Board Member and voting delegate to the Louisiana State Medical Society. He has also served as a clinical educator for both Tulane University School of Medicine and William Carey University. He enjoys several hobbies including international and domestic travel, medical mission work, oenology, and reading. Dr. Wheelis currently resides in both Savannah, Georgia and New Orleans, Louisiana.


Paula Silha, MD

Dr. Silha graduated medical school with honors from the University of Washington School of Medicine and spent the first eleven years of her career working in emergency departments in Spokane, WA. In 2011, while continuing to care for patients in the Emergency Department, she took on the position of Vice President of Quality Control and Regional Director for Coast to Coast Healthcare. Dr. Silha joined the ERx team in February of 2016 continuing in her role as Regional Director. In addition to her work with ERx, Dr. Silha works as clinical faculty for the WWAMI program with University of Washington School of Medicine.


Roger Carrera, MD

Rogelio Carrera earned his bachelor’s degree from Tulane University and graduated medical school from the University of Madrid. He is currently licensed in Kentucky, West Virginia and Michigan. After medical school, Dr. Carrera was in private practice for 16 years before he accepted the role of Director of Ambulatory Services at St. Mary’s Hospital in Norton, VA. While working at St. Mary’s for 7 years, he also provided services in their emergency room. After St. Mary’s, Dr. Carrera worked at various hospitals as an emergency medicine physician and joined ERx as a Regional Medical Director in 2018.