Authors John Mamana My PTontheNET Content My PTontheNET Courses My Web Site John Mamana, M.D., is a Clinical Associate Professor of Medicine at Georgetown University and the Chairman, CEO and Founder of American Health Sciences, Inc. Dr. Mamana is a graduate of Harvard University, Boston University School of Medicine and trained in internal medicine at the University of Pennsylvania Hospitals. After completing his residency, he served as a Full Surgeon in the US Public Health Services. He then founded and became CEO of a multi-specialty group practice, Virginia Medical Associates, which under his tenure became one of the largest group practices in the US. For 17 years, Dr. Mamana served as Chief of Staff and Chief of Internal Medicine at Fairfax Hospital, a 700-bed teaching hospital in Northern Virginia. He has been a Clinical Associate Professor of Medicine at Georgetown University since 1987. Dr. Mamana continues to practice medicine a few hours a week in order to stay engaged in patient care and uncover the perceived needs of the patient/consumer. His practice resides in Springfield, Virginia near the corporate headquarters of American Health Sciences.