After leaving high school, In 1965, Abernethy joined the (then) Petty Sessions Branch of the
New South Wales Department of Attorney General and Justice, where he worked until he became a Stipendiary Magistrate in 1984. Abernethy presided over the inquest into the death of Tegan Lane, the daughter of Australian water polo player
Keli Lane.
Post-retirement Following his retirement, Abernethy has commented on the car pursuits by the
New South Wales Police Force, arguing in favour of them to prevent the escape of criminals. ==Legal issues==