He specializes in interventional radiology and neuroradiology.Dr. Gellad completed his medical training at St. Joseph University in Beirut, Lebanon, in 1975, and performed a residency in radiology at the University of Maryland in 1979. He completed a fellowship in neuroradiology at the University of Pennsylvania School of Medicine in 1981.Dr. Gellad is certified in diagnostic radiology and neuroradiology by the American Board of Radiology.