Dr. Collen is an internationally recognized physician who was born in Oakland, California and grew up in Los Angeles. During the more than 30 years of Dr. Collen’s training and academic association in medicine, he has authored more than 250 original research and review publications, including books, articles, and abstracts. He graduated with a B.A. in Mathematics from UCLA in 1966, and attended Chicago Medical School at Rosalind Franklin University School of Medicine and Science, Chicago, Illinois, graduating in 1970 with an MD degree. He completed a year of internship in medicine and a year of residency in general surgery at UC, Irvine, and then went on to complete an additional two years of residency in Internal Medicine and two years of fellowship in Gastroenterology at UCLA, finishing in 1977. He was an Assistant Professor of Medicine at UC, Irvine from 1977-1980, and was Instructor of the Year for two successive years. He completed a research fellowship in Gastroenterology from 1980-1985 at the National Institutes of Health in Bethesda, Maryland, and was Associate Professor of Medicine and Director of GI Research at Georgetown University Medical Center in Washington, DC from 1985-1990. He moved back to California in 1990, where he was Professor of Medicine at Loma Linda University from 1990-1995 and Clinical Professor of Medicine from 1995-2005. He earned an Executive MBA in Health Care from UC, Irvine in 1999. Dr. Collen has been in private practice as a Gastroenterologist since 1995. He is board certified in both Internal Medicine and Gastroenterology and is a Fellow of the American College of Physicians and the American College of Gastroenterology.