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Expert has been studying developments in nutrition, metabolic syndrome, and obesity for nearly two decades. His work has included research into genetic markers for obesity, NASH 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 serves as principal investigator on a rural elderly nutrition and aging study of some 22,000 individuals.

He is the author of the book chapter on obesity in Conn's Current Therapy, 1999, 2007 and 2008 editions and the co-author of several other textbook chapters. He has also published in several journals, including Archives of Surgery, Current Gastroenterology Reports, Journal of Clinical Gastroenterology, and Surgery for Obesity and Related Disorders. He has lectured on such subjects as vitamin and mineral metabolism; diet, nutrition, and exercise; obesity through the life cycle; and peri-operative medical and nutritional management of the bariatric surgery patient.

Expert is certified by the American Board of Internal Medicine, the American Board of Physician Nutrition Specialists, and the American College of Nutrition, among others. He belongs to several professional societies, including The Obesity Society, American Society of Metabolic and Bariatric Surgery 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 serves on the board of directors for the Surgical Review Corporation, The Obesity Action Coalition and the American Board of Physician Nutrition Specialists as well as others editorial boards. He and his program have been featured on CNN, National Public Radio, ABC News, The Discovery Health Channel and several local affiliates.

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