Harris made his professional theatre debut in 1998 as an original cast and workshop cast member of the world premiere production of
The Boy from Oz directed by
Gale Edwards with
Todd McKenney as Peter Allen, where he also performed in the role of Greg as an understudy. This was quickly followed by another ensemble role in the Australian premiere production of
Mamma Mia! with
Anne Wood, where he also understudied as Sky. He starred as Malcolm in
The Full Monty with
Paul Mercurio and
Matt Hetherington, with other notable roles including the revolutionary student Perchik in the
Fiddler on the Roof with
Topol, and originating the role of Bud in the Australian premiere production of the comedy
Gutenberg! The Musical! with
James Millar in 2009. ,
Lucy Durack, and
Erika Heynatz in
Legally Blonde: The Musical in 2012. In 2007 he starred as Chris in
Sir Cameron Mackintosh's Miss Saigon with
Laurie Cadevida as Kim. Harris received his first nomination for Best Actor in a Musical at the Helpmann Awards as Chris, alongside other nominees including
Hugh Jackman and the eventual winner
iOTA. He also received a nomination in the Sydney Theatre Awards for this role. In 2008 he starred as the "perfect, muscular, golden boy" Joe Hardy in
Damn Yankees for
The Production Company. He also starred as Greg in their season of
The Boy from Oz, directed by
Nancye Hayes AM, with Todd McKenney reprising his role as Peter Allen. Between 2011 and 2013 Harris performed as Fiyero in
Wicked "one of the most successful musicals ever staged in Australia" and was then reunited with his
Wicked co-star
Lucy Durack as Emmett in
Legally Blonde, directed by
Jerry Mitchell. Harris earned a second Helpmann Award nomination for Fiyero and a third nomination for Emmett. He was also awarded a
Green Room Award for Emmett and his second nomination in the Sydney Theatre Awards. In September 2013 Harris starred in the Australian professional premiere of a
Stephen Schwartz's
Children of Eden where he played the dual role of Noah and Adam. This was followed by the demanding role of The Baker in
Stephen Sondheim's
Into The Woods with the Victorian Opera and starring as The Beast in
Disney's Beauty and the Beast in Melbourne. After relocating to the United States, Harris starred as Jean Valjean with the
Connecticut Repertory Theatre, in their production of
Les Misérables opposite
Terrence Mann in 2015. This production was also directed by Terrence Mann. In 2025, he was featured in ''
Stephen Sondheim's Old Friends'' at the
Ahmanson Theatre and on Broadway. ==Concerts==