Dr Quigley received his medical degree from University College Cork in Cork, Ireland; completed internal medicine and gastroenterology training residency in Glasgow, the Mayo Clinic and the University of Manchester.  He was Chief of Gastroenterology at the University of Nebraska from 1991 to 1998 and Dean of the Medical School in Cork, Ireland from 2000 to 2007. He joined Houston Methodist Hospital in 2013 where he serves as Chief of Gastroenterology and Hepatology.