Dr. Montagnese is a Fellow of the International College of Dentists (ICD) for his contributions to dentistry. The ICD is the preeminent worldwide honorary organization for outstanding dentists who have demonstrated abiding interest and concern for their communities and profession through serving others with leadership, integrity, and ethical behavior. Dr. Montagnese has been an invited speaker at the American Association of Endodontist annual meetings and at several international dental conferences. These include the Egyptian Dental Syndicate International Conference, Future University of Egypt International Dental Conference, Mansoura International Dental Congress, Egyptian Dental Association, and the World Congress on Dental Research held in Dubai. His topics included Sedation in Endodontic/Dental Practice, The Restoration of Endodontically Treated Teeth, and The Diagnosis, Prognosis, and Treatment of Cracked and Fractured Teeth

Dr. Montagnese was a volunteer Clinical Assistant Professor for fourteen years on the faculty of Case Western Reserve University, School of Dental Medicine, Endodontic Department. He was a full-time faculty member for nine years before retiring as Associate Professor. During his tenure as a full-time faculty member, he started and was the Course Director for the Sedation in Endodontic Practice course for graduate endodontic students and provided sedation services in the Graduate Endodontic Clinic. He also was on the staff of University Hospitals/Cleveland Medical Center with the Pediatric Dental Residency Program where he oversaw graduate endodontic students working with the pediatric dentistry residents in the operating room. Dr. Montagnese received his training in intravenous sedation from Miami Valley Hospital in Dayton Ohio in 1997. He is one of the few endodontists in the United States provides moderate sedation to his patients. He holds a permit in Intravenous Conscious Sedation from the Ohio State Dental Board.

Dr. Montagnese was born and raised in Lorain, Ohio. He graduated from Clearview High school in 1966, did his pre-dental studies at the University of Cincinnati from 1966 to 1969, and graduated from The Ohio State University College of Dentistry in 1973. After graduating from dental school, he served with the United States Navy Dental Corps as a Lieutenant at Subic Bay Naval Station, Republic of the Philippines from 1973 to 1975. From 1975 to 1976 he was an associate in a general dental practice in Lorain. From 1976 to 1977 he taught endodontics at Pahlavi University in Shiraz, Iran. In 1978 he started his specialty training in endodontics at The Ohio State University College of Dentistry and received his Certificate in Endodontics and Master of Science degree. His Master's Thesis was published in the Journal of Endodontics. He then practiced with an endodontic group practice for four and a half years before starting his own practice in Lorain in 1985.