Johnson attended Somerset College on the Gold Coast, and graduated from Queensland University of Technology in 1999.

His film credits include City Loop (2000), The Wannabes (2003),[1] Thunderstruck (2004),[1] All My Friends Are Leaving Brisbane (2007),[1] Monkey Puzzle (2008),[1] Jucy (2010) and Guardians of the Tomb (2018).

He appeared in his first major television role in the short-lived Head Start in 2001, followed by roles in successful Australian drama series, including All Saints,[1] The Secret Life of Us,[1] Underbelly,[1] Sea Patrol, Rake, Love Child and House Husbands.

[1] In October 2011, it was announced Johnson had joined the main cast of US drama Fairly Legal for its second season, as trial attorney Ben Grogan.

[7] Johnson lives with his wife Leah Da Gloria, a fashion designer, and has one child, a daughter, with tv writer, Tamara Asmar.