Josh was born and raised in Brisbane, Queensland and attended St. Joseph's College, Gregory Terrace. He graduated from Australia's National Institute of Dramatic Arts in 2001 and spent one year studying improvising techniques in Los Angeles at the Second City and The Groundlings.
He has also been a guest star in TV shows such as Blue Heelers and Home Away. Now one of the most popular guest stars on Thank God You're Here with his quick wit and funny quotes, he has won the MVP award for appearing on the show three times.
He made his film debut in the Aussie movie "Boytown" in 2006. His brother, Ben Lawson, is also an actor and is currently playing Fraser on Neighbours.