Dr. Gary Johnson was born and raised in Effingham County. He graduated from Effingham County High School in 2000. After high school, he attended Georgia Southern University receiving a Bachelor's degree in Business Management. Dr. Johnson then attended the Dental College of Georgia at Augusta University where he received his Doctorate of Dental Medicine in 2016.
In 2008, Dr. Johnson married Mallorie Johnson, who is also a graduate of Effingham County High School and Georgia Southern University. They have two sons, Tripp and Jake and recently had a little girl, Charlotte. They attend Springfield United Methodist church where they both have been active members since childhood.