Walker's first acting credit was a small role in
The Flying Doctors in 1989. He also appeared in the 1991 film
Proof in flashback sequences of
Hugo Weaving's character as a child. In 1992, he took over the role of Bronson Twist in the television series
Round the Twist, based on the books by
Paul Jennings. In 1994 he received a leading role in
Ocean Girl as "Brett Bates". He had another major role as the brother Royce on
Mirror, Mirror. Walker received leading roles in
The Wayne Manifesto in 1996 (for which he received a Young Actor's Award from the
Australian Film Institute) and
Thunderstone (1999), in which he played Wayne and Noah Daniels respectively. Since his appearance in
Thunderstone, Walker has focused his efforts on directing, working on soaps such as
Neighbours and
Home and Away and series such as ''
Holly's Heroes'' and children's series
Dance Academy,
Wicked Science,
H2O: Just Add Water,
The Elephant Princess and
Blue Water High. Walker has directed episodes of US TV series including
Modern Family,
Bones,
Young Sheldon and
Young Rock. Walker was closely associated with the
Dance Academy children's franchise. He was the setup director for the first five episodes of the TV series, and directed eight episodes in total, plus the 2017 spinoff feature film
Dance Academy: The Movie. He made his feature film directorial debut with the romantic comedy ''
Ali's Wedding'', adapted from a memoir by
Osamah Sami. He has directed numerous well-received miniseries and limited series for streaming, including the BBC's historical drama
Banished;
Lambs of God for
Foxtel;
The Commons for
Stan; and
The Clearing for
Disney+. ==Awards==