Geoff James Nugent (born 14 February 1977), known professionally as Jim Jefferies, is an Australian comedian, actor, and writer who holds dual Australian and American citizenship. He created and starred in the American FX sitcom Legit (2013–2014) and the Comedy Central late-night show The Jim Jefferies Show (2017–2019).
Jefferies was born Geoff James Nugent in Sydney on 14 February 1977, the son of a mother who worked as a substitute teacher and a father who was a cabinet maker and maintenance worker. His father was from Roma, Queensland. Jefferies grew up in Sydney before moving to Perth to study musical theatre and classical music at the Western Australian Academy of Performing Arts. though he left several months before graduating. He has two older brothers: Scott, an investment banker, and Daniel, an inspector in the New South Wales Police Force's Public Order and Riot Squad.
Jefferies began his stand-up comedy career after dropping out of university, initially returning to his native Sydney before relocating to the United Kingdom. He took the stage name "Jim Jeffries", but amended the last name to "Jefferies" to avoid confusion with a similarly named American performer. He initially began performing stand-up with one-liners. He changed to anecdotal humour when he began doing hour-long sets. He first achieved international attention in 2007, when he was attacked onstage while performing at the Manchester Comedy Festival. Footage of the incident was incorporated into his act and can be seen on his 2008 DVD Contraband. He became known in the United States in 2009, after the release of his debut HBO special I Swear to God.

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