He received his Bachelor's degree from U.C.L.A. in 1971, where he worked as an undergraduate Research Assistant with Dr. Ivar Lovaas. He received his Ph.D. from Southern Illinois University in 1974 with D. Nathan Azrin, his P.P.S. Credentials in both school psychology and guidance and counseling in 1999, and his Administrative Services Credential in 2005. Dr. Nunn is Board Certified as a Behavior Analyst and also certified in both Biofeedback and Neurofeedback, as both a Critical Incident Stress Management and AVID Counselor, as a Remedial Reading Specialist with the Language Curriculum by Jane Fell Greene, Sopris West, the Lindamood-Bell, LIPs Method, as a Certified Mentor for the DIBELS assessments, and the REWARDS Reading Program.