After dropping out from
Blackwood High School in 2000, he became a freelance graphic designer before being employed by design firm, Egplant. In 2004 along with, Jeremy Ervine, he launched
Fnuky, an advertising agency which promised "big ideas, not just ads". He served as the agency's creative director, leading it to become South Australia's most internationally awarded creative agency with its work being recognised in major advertising award shows in London, Berlin, Los Angeles, Sydney and Cannes. In May 2012 he was awarded a Gold Clio, one of the advertising industries highest honors. David has also shown an interest in filmmaking, personally directing many of the agency's ads. In 2012 he directed his first short film,
Afternoons With Max Marshall. Only months later he directed a short comedy, Blind, starring
Francis Greenslade. Campbell served a short stint as a director of publicly listed not-for-profit organisation,
Fanconi Anaemia Australia Limited before resigning to run as a candidate in the
Adelaide City Council election in 2007. == Controversy ==