She apprenticed as an unpaid assistant on several documentaries and music videos before shooting her first feature film, Return Home, at the age of twenty-five.
[1] Additional screen credits include Parklands, The Well, Lantana, Australian Rules, Shattered Glass, and Australia.
Walker has filmed commercials for Nike, Toyota, Caltex, Cingular Wireless, Foxwoods Casino and, most notably, the spot for Chanel No.
[1] Walker was appointed a Member of the Order of Australia for "significant service to film as a cinematographer, and to professional societies" in the 2021 Queen's Birthday Honours.
[5] On 5 March 2023, she became the first woman to win the American Society of Cinematographers Award in the feature film category, also for Elvis.