Jack started out playing basketball in 1928 at the Sydney YMCA. He was a keen gymnast and was the Sydney YMCA champion in 1930-31-32. From 1948 to 1955, he was the Vice President of the Amateur Gymnastics Association of NSW.
Jack also represented NSW YMCA as a basketball player and in 1936 he helped establish a Sydney YMCA basketball competition. By 1939 he was instrumental in establishing the City of Sydney Basketball Association, held the position of chairman of that Association until 1960 and was Vice President of the newly established BNSWABA. During World War Two he established the Sydney Metropolitan Association which took in teams from all over the city. Jack then reverted competition back to separate Associations after the war.
In 1946, Jack was influential in the staging of the first national men’s championship which was held in Sydney. The British Standard Trophy for that inter-state competition was introduced by him. He was an active member of the State Association from 1946 to 1955, its president from 1955 to 1974 and became a patron in 1982. Jack was an NSW delegate to the ABU, a basketball official at the 1976 Olympics, and a member of the FIBA Commission on By-Laws. He is a Life Member of the Sydney Basketball Association, BNSW, and BA. He was awarded an OAM for services to basketball in 1979.