Mullinar born in Hereford, Hertfordshire, emigrated to Australia in 1966, at the urging of an Australian friend in London, Bill Hunter.
[3] Mullinar took the leading role in Australian espionage drama Hunter late in the show's run in 1968, however he appeared in just eight episodes due to the cancellation of the series.
[4] An article in the Sydney Morning Herald in 1969 claimed that, before migrating to Australia, Mullinar had a small role in the 1965 James Bond film Thunderball as well as appearing in the British TV series Z Cars and No Hiding Place.
It stated that Mullinar had been shortlisted for the role of Frank Banner in Division 4, which was ultimately given to Gerard Kennedy.
[6] Mullinar's other credits include: Cop Shop, Bellbird, Homicide, Division 4, Matlock Police, Against the Wind, Breaker Morant, Prisoner, Five Mile Creek, All Saints, Stingers, Joanne Lees: Murder in the Outback, Reef Doctors, The Lost World, and The Doctor Blake Mysteries.