CMHC Faculty Members

Faculty of Tarsus Medical Group are leaders in healthcare

Christopher D. Still, DO, FACP, FTOS

Danville, PA

Christopher D. Still, DO, FACP, FTOS

Obesity Medicine


Christopher D. Still, DO, FACP, FTOS, is Professor of Medicine at the Geisinger Commonwealth School of Medicine. He is also the Medical Director, Center for Nutrition and Weight Management; Director, Geisinger Obesity Institute; Geisinger Health System, Danville, Pennsylvania.

Dr. Still has been studying developments in nutrition, metabolic syndrome, and obesity for nearly 3 decades. His work has included research into genetic markers for obesity; nonalcoholic steatohepatitis, and diabetes; the metabolic differences among obese, formerly obese, and normal-weight men; surgical options for severely obese persons; and leptin-level determination among elderly obese women. He is principal investigator on a rural elderly nutrition and aging study of approximately 22,000 individuals.

Education and Training

Dr. Still received a Master of Science degree from Columbia University Institute of Human Nutrition in New York City and his osteopathic medical degree from The Philadelphia College of Osteopathic Medicine, Pennsylvania. He completed his internship at the University of Buffalo at Sisters of Charity Hospital, New York, followed by a residency in internal medicine and a subsequent fellowship in clinical nutrition and obesity treatment at Geisinger Medical Center.

Professional Highlights

Dr. Still is certified by the American Board of Internal Medicine, American Board of Obesity Medicine, American Board of Physician Nutrition Specialists, and American College of Nutrition. He is a member of several professional societies, including The Obesity Society, American Society for Metabolic and Bariatric Surgery (ASMBS), and the American Society of Parenteral and Enteral Nutrition. He is a fellow of the American College of Physicians and the American College of Nutrition. He served on the board of directors for the Obesity Action Coalition and is the past president of the National Board of Physician Nutrition Specialists. He and his program have been featured on CNN, National Public Radio, ABC News, and The Discovery Health Channel. He was awarded the ASMBS Integrated Health Circle of Excellence Award.

Dr. Still has recently edited the book Nutrition and Bariatric Surgery, the ASMBS Textbook of Bariatric Surgery, Volume 1, as well as authored multiple textbook chapters. He has published articles in several journals, including The New England Journal of Medicine, Obesity, Proceedings of the National Academy of Sciences, Lancet Endocrinology, Annals of Surgery, Gastroenterology, Journal of Clinical Gastroenterology, Surgery for Obesity and Related Disorders, and Human Molecular Genetics. He has lectured on topics such as vitamin and mineral metabolism; diet, nutrition, and exercise; obesity through the life cycle; and perioperative medical and nutritional management of the bariatric surgery patient.


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