[3] He had an older brother Robert Gray Hepburn (1869–1940) who was also a professional golfer.

[4] Hepburn, a club maker of some renown, was one of the founding members of the PGA of America when he served as chairman of the seven-member organizing committee.

He was joint runner-up in the inaugural Tooting Bec Cup in 1901, three strokes behind the winner J. H. Taylor,[7] and was a semi-finalist in the British PGA Matchplay Championship in 1904 and 1909.

Hepburn also spent time at Home Park (Surbiton, Surrey), from 1900 until early 1915 where he maintained a successful club-making business by partnering with Hugh Williamson, brother of the noted touring professional Tom Williamson.

[10] In May 1915 he emigrated to the United States and became the professional at the National Golf Links in Southampton, New York, and remained there until 1928.