Mark Pimentel, MD

Mark Pimentel, MD, director of the GI Motility Program and Laboratory at Cedars-Sinai Medical Center in Los Angeles, where he specializes in irritable bowel syndrome and its relationship to small intestinal motility and bacterial overgrowth. He is the creator of the IBS blood tests described in this article. (Disclosure: Dr. Pimentel receives consulting fees from Commonwealth Laboratories, which produces the tests.)