Greg played in the Premiership winning Team against Easts (Roosters) as fullback after Stan Cutler had broken his ankle two weeks earlier.

Greg was the regular fullback in 1981 in an interrupted season and won the Rothmans Medal in 1982.

In 1983, Greg was injured for most of the season. He played his last game as a replacement in the Preliminary Final against Parramatta after playing in the reserve grade Semi-Final against St George.

Greg will be remembered for his left footed drop punts which gained 50 meters from penalty kicks and kicks down field.

Greg was later a Development Officer in the Riverina and after assisting Chris Anderson with the Melbourne team, has become the Development Manager for the Melbourne Storm.

In 2004, Greg was named as a reserve in the Berries to Bulldogs 70 Year Team of Champions. On April 1 2007, he was inducted into the Bulldogs Ring of Champions.