Moriarty, the son of dual Fitzroy premiership player Geoff, was a lightly built full forward who became a spectacular success after leaving Essendon Football Club at the end of 1923 and crossing to Fitzroy Football Club.
Despite standing only 5'10" (178 cm), and weighing approximately 60 kg, he had the ability to jump over opponents and take strong over-head marks, as well as being a goal-sneak. In each of his first three matches with Fitzroy, Moriarty kicked seven goals en route to a then VFL season record of 82.
He topped Fitzroy's goal kicking list every year between 1924 and 1933, except for 1930, and was voted the club's best and fairest player in 1927 during an era when an award of this type was not made every season.
At the end of his career, Moriarty had booted 662 goals in his 170-game VFL career, at an average of almost four goals per game.
His total of 626 career goals for Fitzroy remained the club record when Fitzroy exited the VFL/AFL in 1996.
- Fitzroy best and fairest 1927.
- Fitzroy Leading goalkicker 9 times (1924, 1925, 1926, 1927, 1928, 1929, 1931, 1932, 1933).
- Fitzroy Team of the Century.
- VFL Leading goalkicker Medal 1924.
- Essendon Leading goalkicker 1922.
- Victorian representative (11 games, 42 goals).
- AFL Stats (2008). Fitzroy Players: Jack Moriarty. Retrieved on 4 May 2008.
- Full Points Footy (2008). Biographies: Jack Moritaty. Retrieved on 4 May 2008.
- Gough, Paul (2004). Six greats inducted into Hall of Fame. Australian Football League. Retrieved on 4 May 2008.
- Brisbane Lions (2008). Honour Roll: Fitzroy Football Club Honour Board 1897 – 1996 Archived 10 May 2008 at the Wayback Machine. Retrieved on 4 May 2008.
- Footy Stamps (2006). Fitzroy Football Club: Team of the Century. Retrieved on 4 May 2008.
- Australian Football League (2008). Coleman Medal List. Retrieved on 4 May 2008.