[3] He made his screen acting debut in 1989 in the Australian drama series A Country Practice and subsequently had roles in Home and Away, G.P.
Subsequently, a series of six half-hour documentaries was completed[7] where prominent Australians of ethnic parents travel back to the birthplace of their ancestors.
In 2003, Gaha began working on Survivor (US) as supervising producer with Mark Burnett where he was nominated twice for the primetime Emmy Award.
[8] With Burnett, he worked as co-executive producer on The Apprentice, The Contender, Pirate Master and Rock Star.
[4] On 24 September 2014, it was announced that Gaha would co-produce Aloha Vet with Mike Aho for Nat Geo Wild.