Dr. Guengerich was born and raised in Pekin attending Pekin HighSchool. He attended Western Illinois University before graduating from the University of Illinois College of Dentistry in Chicago. Dr. Guengerich is a member of the American Dental Association, Illinois State Dental Association, Peoria District Dental Society, Chicago Dental Society, and the Academy of General Dentistry. He has participated in the Illinois Mission of Mercy. In his spare time, activities include golfing, hiking, backpacking, and climbing.