John Ghazi received a B.S. in Chemical Engineering from Rutgers College of Engineering in 1980, and an M.D. from Rutgers Medical School in 1986. He completed an internship in internal medicine at Robert Wood Johnson University Hospital in New Brunswick, and later he completed a residency in radiology and a fellowship in body imaging at New York University Medical Center in New York City. He continued fellowship training in nuclear medicine at NYU until 1991.

Dr. Ghazi was Board Certified in diagnostic radiology in 1991 and was awarded a certificate of special competency in nuclear radiology in 1992. He has been a member of Princeton Radiology Associates since 1992, and is currently a member of the AMA, the Society of Nuclear Medicine, and the Medical Society of New Jersey.