He took on occasional writing and announcing roles and was involved in production of John Dease's Quiz Kids.

[1] He helped Sir Charles Mackerras (an old schoolfriend) prepare classical music programmes for radio.

He appeared in stage and television productions, and took on the positions of federal treasurer for Actors Equity.

He was involved in the doomed campaign to save the Regent Theatre in Sydney from demolition and helped manage the Actors' Benevolent Fund.

Throughout the 1980s and 1990s Nettheim appeared in guest roles in numerous Australian TV mini series and serials, including Prisoner, Sons and Daughters, and A Country Practice.