Hall graduated from the University of Cincinnati College of Medicine, located in Cincinnati, Ohio. He practiced as Dr. Gary Hall, MD as an ophthalmologist in Phoenix, Arizona at the Gary Hall Lasik Center. Common conditions he treated in Ophthalmology included Macular degeneration and Cataracts. In 2005, following a series of medical errors and reprimands dating back to 1996, the Arizona Medical Board permanently banned Dr. Hall performing or assisting in any surgery. He was placed on a five-year probation, but allowed to keep his medical license. In 2009, he was stripped of his medical license when he was unable to pay a fine after he was found performing surgery.
In 1981, Hall was inducted into the International Swimming Hall of Fame as an "Honor Swimmer." Later on, he also became a local celebrity in Phoenix, as an ophthalmologist – appearing in his office's television ads and billboard campaigns. His son Gary Hall Jr. has become a famous Olympic swimmer as well, starting in the Atlanta 1996 Olympic Games, getting various gold medals at the 2000 Olympics in Sydney, Australia. With his son's participation at the 2004 Olympics in Athens, Greece, the Halls became the first father-and-son pair to make three Olympic appearances.
Summer swimming camps
Gary Hall Sr. currently lives in Florida and operates The Race Club summer swimming camps. The Race Club is a swimming club founded by Gary Hall Jr. and his father Gary Hall Sr. The swimming club, originally known as "The World Team," was designed to serve as a swimming training group for elite swimmers across the world in preparation for the 2000 Sydney Olympic Games. To be able to train with The Race Club, one must either have been ranked in the top 20 in the world the past 3 calendar years or top 3 in their nation in the past year. The Race Club included such well known swimmers as Roland Mark Schoeman, Mark Foster, Ryk Neethling, Milorad Čavić and Therese Alshammar. They were coached by University of Michigan coach Mike Bottom. The Race Club provides facilities, swimming techniques coaching, swimming training programs, technical instruction, swimming technique videos, fitness and health programs for swimmers of all ages and abilities. The Race Club summer swim camps are designed and tailored to satisfy each swimmer's needs, whether one is trying to reach the Olympic Games or simply improve one's swimming techniques. The swimming camps programs are suitable for beginner swimmers, pleasure swimmers, fitness swimmers, USA swimming or YMCA swimmers, or triathletes; anyone who wants to improve swimming skills.