Jack commenced his first grade career with Western Suburbs Magpies in 1981. The following year he moved to Balmain Tigers where he played for the rest of his Australian first grade career. His association with English rugby league began at the end of the 1986 Kangaroo tour when he stayed on to play for Salford before returning to the Tigers. He was member of the consecutive Balmain teams which fell at the final hurdle to firstly Canterbury-Bankstown in the 1988 Grand Final and then to Canberra in 1989. 1991 saw the departure of Warren Ryan as Balmain coach and the arrival of former Wallaby coach, Alan Jones. The years playing under Jones at Balmain were unhappy ones for Jack and eventually after he had left the club in 1992 and launched an attack on Jones’ ability as a coach following his ‘surprise’ reappointment for a third year. When his Australian club career ended having surpassed Keith Barnes' club record for first grade matches, he returned to England to play his final season with the Sheffield Eagles.
Representative career
In the 1984 State of Origin series Jack made his New South Wales début and played in all three games of that year's series. He was thereafter the Blues' first choice fullback for the next six years, aside from the 1987 fourth game exhibition match in Los Angeles when he made himself unavailable, and game I of 1988 when Cronulla's Jonathon Docking was preferred. Jack made 17 appearances for New South Wales in State of Origin series between 1984 and 1989. In 1984, he also made his international début in the three match Ashes series against Great Britain. He played twenty successive Tests as well as the 1988 World Cup Final against New Zealand and the Bicentenary International against a Rest of the World team. On the 1986 Kangaroo tour, Jack played in all six Tests and seven minor Tour matches. He became the first Australian fullback to score three tries in a Test against France in the second Test. On 20 July 1988, Jack played for Australia in their record 62-point win over Papua New Guinea, scoring a try. After Jack broke an arm in a 1989 pre-season match the door opened for his State of Origin rival Queenslander Gary Belcher who from that point was the favoured Australian representative for the fullback position.
