Eric C Greenberg's Biography.Eric C. Greenberg, MD, CPT's Biography Eric Greenberg, MD, CPT is a personal trainer certified by the American College of Sports Medicine. He lives in Bethesda, 9305 Old Georgetown Road next to the YMCA a mile north of Suburban Hospital. Dr. Greenberg has a lifetime commitment to personal health, fitness, and sports and is dedicated to helping others peruse this commitment. Dr. Greenberg received his BA in Humanities at the Johns Hopkins University in 1988. He was member of the crew and wrestled while he completed his pre-med requirements at Hopkins.