When Dr. Johnston is not in the office, he dedicates his time to bettering his local community. He has served as a Partner in Education for Sope Creek Elementary School, Dodgen Middle School, and Dickerson Middle School. Dr. Johnson is also involved with the following philanthropic organizations or projects:
Dr. Johnston is a proud resident of Sandy Springs where he shares a beautiful home with his wife Helene. Dr. Johnston and his wife have three daughters named Taylor, Chandler, and Bailey, a son-in-law named Durham, and a son named Watts. In addition to their children, The Johnstons also have three fur babies named Pearl, Greta, Cooper, and Gary. In his spare time, Dr. Johnston enjoys hunting fishing, boating, and spending time in the North Georgia Mountains with his family.