Attended Newport Municipal Secondary School, played for Welsh Secondary Schools as full back , then became a great wing three-quarter. Played for Newport RFC 1927-28 to 1931-32 scoring 29 tries in his first season from 36 appearances and a further 29 tries from 35 appearances in 1928-29. Lightning fast with swerve and change of pace and sound in defence.
Won his first cap at 19 years of age against England in 1929 and scored the only try in 3 v 8 defeat at Cardiff Arms Park. Went on Lions Tour and scored 8 tries in 13 games before being injured. Scored winning try at Dunedin with a 50 yards run for first ever Lions Test win in New Zealand later being injured. Became the regular right wing for Wales 1929-1932 winning 14 caps. His last appearance for Wales being against Ireland at Cardiff in March 1932 (Lost 10 v 12). New Zealand rugby writer Terry MacLean wrote "Jack Morley was only knee high to a grasshopper, but when he got the ball it was good night, nurse."
Captained Newport in 1931-32 including against South Africa in October 1931 (Lost 3 v 15) setting up Ken Richards for a try after a typical swerving run, becoming a "marked" man by the South Africans for the remainder of the game.
Went north with Wigan Rugby League in August 1932 and played for Great Britain. First player to tour Australasia with both British Rugby Union and Rugby League teams. Scored a try for Wigan in the 1933-34 Rugby League Championship Final 15 v 3 win against Salford. Made 292 appearances for Wigan scoring 677 points including 223 tries between 1932-33 and 1938-39.
Qualified as a dentist at Wigan and later returned to Monmouthshire in that professional capacity.