In 1992, Walker produced, directed, photographed and edited the PBS documentary Post No Bills on Los Angeles "guerilla" satirical political poster artist Robbie Conal. Post No Bills received a Silver Hugo at the 1992 Chicago International Film Festival. Post No Bills was exhibited on PBS from 1993 – 1996 and was the first completed broadcast-hour ITVS-funded project in history.
Walker has a degree in Film & TV Production from the School of Cinema & Television at the University of Southern California in Los Angeles. Walker operates the film production company Plan B Productions.