Jack Cassimar Treanor was born on 17th August 1922 at Darlinghurst and died on 7th November 1993 at East Ballina, NSW. He was a right-hand leg-spin bowler and moderate left-handed batsman.
Treanor bowled in a similar manner to the former great Test leg-spinner Bill O’Reilly, pushing the ball quickly through the air and bowling with great accuracy. Not being a big spinner of the ball, he relied on trapping the batsman around the crease line – utilizing a combination of the accuracy, nip off the pitch and a bouncing top-spinner to detonate the batsman’s downfall. A dedicated bowler he had ‘scant respect’ for batsmen – ‘they were his sworn enemies’.