Dr. Gebeck attended St. John's University in Collegeville, Minnesota, and then was enrolled in the School of Dentistry at the University of Minnesota, receiving his D.D.S. degree in 1964. After serving three years in the United States Navy, Dr. Gebeck enrolled in the Graduate Program in the Department of Orthodontics at the University of Michigan, completing an M.S. in Orthodontics in 1969.

Dr. Gebeck maintains a private practice limited to orthodontics in Grosse Pointe, Michigan and teaches in the graduate orthodontic clinic on Fridays. He is a member of the teaching staff of the Charles H. Tweed International Foundation for Orthodontic Research and is a past president of that organization.