The son of the two-time Olympian Harry Evan James, Jack Evan James competed at the 1928 Amsterdam Games in the team foil event, which was his début in an international competition. A quartermaster sergeant instructor in the Army, James had not won a British title at the time of the Olympics, despite reaching the final pool that year. He rectified that in 1929, however, when he emulated his father from 28 years earlier and carried off the foil title, beating Denis Pearce and Cyril Simey into joint-second place.