After graduating from Temple University, Philadelphia, Pennsylvania with a degree in Mathematics, Dr. Peikin attended Jefferson Medical College of Thomas Jefferson University where he received his M.D. degree in 1974. He graduated magna cum laude and received the Alumni Award for the highest grade point average. He was also president of Alpha Omega Alpha the honor medical society and was awarded the surgery and medicine prizes while at Jefferson.

Dr. Peikin completed an internship and residency in internal medicine at University of California in San Francisco followed by a gastroenterology fellowship at the National Institute of Metabolism and Digestive Disease, National Institute of Health (NIH) followed by a gastroenterology fellowship at Harvard Medical School and Massachusetts General Hospital in Boston.

Dr. Peikin is board certified in internal medicine and gastroenterology. After finishing his training he became Assistant and subsequently Associate Professor of Medicine at Jefferson Medical College of Thomas Jefferson University. He was Acting Director of the Division of Gastroenterology and Hepatology in 1985-1986. In 1992 he began his current position at Cooper Hospital/University Medical Center. Dr Peikin has authored and co-authored numerous papers in the field of gastroenterology and is author of a best selling book, Gastrointestinal Health, published by Harper Collins. Dr. Peikin has been selected by his peers as a "Top Doctor" for both Philadelphia Magazine and New Jersey Magazine. He has been selected to "Best Doctors in America" and was selected by the medical students of Robert Wood Johnson Medical School to receive the Golden Apple Teaching Award 1997-2001.