Since graduating from The National Theatre, Keith has performed extensively throughout Australia, most notably for Melbourne Theatre Company Happy Ending, La Mama Theatre Porcelain, The Yellow Peril, Still A Hero, 5Pound Theatre Noises Off, Because of Reasons, The Tempest, Sex Diary of an Infidel and Chapel Off Chapel All That I Will Ever Be. He also received the Best Male Actor Award for his performance in Death by 1000 Cuts at the 2007 Short + Sweet Festival.

He was a series regular in the ABC cult hit The Librarians, for which the cast received Best Comedy Ensemble at the inaugural Equity Awards, and has worked on Rush, The Time of Our Lives, Bruce Lee Played Badminton Too, and Verite. Keith is a co-founder of The Kin Collective, as well as a member of the Melbourne-based theatre company 15 Minutes from Anywhere, and part of the current ensemble for the improvised comedy troupe The Big Hoo-Haa! Melbourne.

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