Keith, a distinguished alumnus of NIDA (class of 1986), left an indelible mark in the world of acting, directing, and producing, both in Australia and internationally. His exceptional talent was recognized when he was nominated for the Green Room Awards as the Outstanding Male Actor in 2014 for his role in "Henry V" (Bell Shakespeare), and again in 2016 for the Sydney Theatre Awards as the Best Male Actor in a Leading Role for "The Whale" (Red Line).

His contributions to film and television were significant, with notable roles in Wyrmwood (2014), Paper Giants: The Birth of Cleo (2011), Crownies (2011), Home and Away (1988), Fireflies (2004), All Saints (1998), White Collar Blue (2002), State Coroner (1997), Blue Heelers (1994), Phoenix (1992), and Embassy (1990).