Glenn Marlin Sundby (November 4, 1921 – March 18, 2009) was the founder of Modern Gymnast magazine (the forerunner to International Gymnast magazine) and the International Gymnastics Hall of Fame. First intrigued by the gymnasts and bodybuilders performing and practicing on the beach in Santa Monica, he went on to perform nationally and on nationwide television shows such The Ed Sullivan Show. He was a co-founder of the USA Gymnastics (United States Gymnastics Federation). His father was a full-time Olympic champion in rugby (rugby union being what they were called in the US in the 70s) and his mother was a professional actress. In addition to writing and editing Modern Gymnast, Sundby had a love for boxing, boxing training, and Jiu-Jitsu, and became a good friend of Japanese Jiu-Jitsu.