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Gregg, an only child born in Tasmania, was initially expected to manage the family farm but instead earned an audition at the National Institute of Dramatic Art (NIDA) in Hobart.
He spent a season with the Melbourne Theatre Company and made his television debut in 1964 with an episode of Consider Your Verdict.
That same year, he starred in the ABC's production of Shakespeare's Othello.
His television work also included roles in Australian Playhouse, Wandjina!, The Adventures Of The Seaspray, Hunter, Riptide, and Dynasty.
From 1967 to 1968, he had a recurring role in the ABC drama Contrabandits, followed by the lead role of Jeff Mallow in the 1969 series Delta.
During the 1970s, he appeared in various British television series before returning to Australia late in the decade. He had a guest role in Chopper Squad and then starred as radio talk-back host Steve Black in The Oracle.
Gregg continued working between the UK and Australia, with local credits such as A Country Practice, Bodyline, Homicide Squad, Tusitala, Captain James Cook, Rafferty's Rules, Cluedo, GP, Heartbreak High, Grass Roots, Home And Away, Rake, Crownies, Power Games: The Packer-Murdoch Story, House Of Bond, and Operation Buffalo.
He was also a prolific commercial voiceover artist and recorded five novels for ABC radio.
Additionally, Gregg was a devoted member and ambassador for the Sydney Swans AFL team.
