John A. Berthelot was born in Baton Rouge, Louisiana, and has lived in Gonzales, Louisiana since his birth.
He was educated in both the parochial and public schools in Gonzales. He attended St. Thomas Catholic School, Gonzales High School and East Ascension High School. He is a 1969 graduate of East Ascension and upon graduation, he attended and graduated from the New Orleans Barber College in 1970. He also attended the LSU Continuing Education Program in Real Estate and completed this course in 1975.