John was born in Tiffin Ohio. He earned a Bachelor's degree in Biology from the University of Cincinnati in 1982. He entered Wright State University School of Medicine and graduated in 1988. He served an internship and residency in Internal Medicine at the Medical College of Ohio. He is Board Certified by the American Academy of Allergy and Immunology, which is the focus of his practice. He is involved in Cancer Research at the Cleveland Clinic and he resides in Cleveland.