Dr. Mulhall received his undergraduate degrees in biology and philosophy/ethics at the University of San Diego and received his medical degree from St. Louis University.  He completed his internal medicine residency at Madigan Army Medical Center, where he subsequently served as the Chief of Medical Residents.  Upon moving to Washington D.C., he completed his fellowship in gastroenterology & hepatology at Walter Reed Army Medical Center, while concurrently earning a masters degree in public health from the Uniformed Services University of the Health Sciences.  He was selected to stay as faculty at Walter Reed, where he was asked to serve as the Director of the Center for Liver Disease.  He returned to the Pacific Northwest in 2005, rejoining many of his former colleagues at Madigan Army Medical Center as a staff gastroenterologist.

Dr. Mulhall is especially interested in inflammatory bowel disease, biliary and liver processes, along with functional intestinal disorders.  Dr. Mulhall has been recognized for his research endeavors and his teaching abilities.  He has written numerous medical publications and has presented his findings, as well as facilitated educational sessions, at national meetings.  He has been active in the American College of Gastroenterology and American Society for Gastrointestinal Endoscopy, serving on the research committees for both societies and remains the editor for the Clinical Advances in Gastroenterology series for the ACG.