Dr. Riachi graduated with an MD degree from the American University of Beirut in 1986. From 1986 until 1990, he did a postdoctoral fellowship in Neurology at the Cleveland Clinic Foundation in Cleveland Ohio. This was followed by a one-year residency in Internal Medicine at Mount Sinai Hospital in Cleveland Ohio, and subsequently , by a residency in Neurology from 1991 through 1994 also at the Cleveland Clinic Foundation in Cleveland Ohio. He was appointed Chief Resident from 1993 through 1994.