His 2008 documentary film, Beyond Our Ken explored the group Kenja Communication, a controversial Australian "self-empowerment" organisation.
It garnered Walker an AACTA Award for Best Direction in a Documentary nomination (shared with co-director Melissa Maclean).
[2] The film follows Harold Bell Lasseter's elderly son on his last desert expedition to find his father's lost gold.
[4] Walker's 2017 documentary PACmen follows the Super-PACs backing Ben Carson's ill-fated presidential campaign.
[6] Walker was born in Birmingham, West Midlands, England, and is a graduate of the Victorian College of the Arts.