Dr. Thornton graduated from Emory University School of Dentistry in 1979. He began attending courses at the L.D. Pankey Institute in 1995 and completed the continuum series in 2000. Dr. Thornton received a Fellowship Award from the Academy of General Dentistry in 2003. Dr. Thornton was an adjunct professor at the University of Oklahoma School of Dentistry and is also Co-Founder of the Massad Center for Removable Prosthodontics in Tulsa, Oklahoma.