Dr. O'Reilly is a native of Minnesota. He earned his undergraduate degree at Grinnell College. He then received his medical degree at the University of Minnesota in 1990. Dr. O'Reilly's internship and residency in Internal Medicine were completed at Hennepin County Medical Center. He completed his fellowship at the University of California Los Angeles Medical Center in 1996.
Dr. O'Reilly is a Diplomate of the National Board of Medical Examiners, the American Board of Internal Medicine for both internal medicine and gastroenterology. He was appointed Clinical Assistant Professor in the Department of Family Practice and Community Health at the University of Minnesota.
He was appointed Clinical Assistant Professor Department of Family Practice Community Health at the University of Minnesota Medical School (1999- 2004 ) and later promoted to Clinical Associate Professor Department of Family Practice and Community Health at the University of Minnesota Medical School (2004- present ).
He was a presenter at the Presidential Plenary Session of the international conference, Digestive Disease Week - picked for the ASGE President’s Plenary Session and the “Best of DDW” oral presentation at Digestive Disease Week.
He is Chairman of the MNGI celiac committee.