Since the 1990s, she has directed and produced independent projects and been part of film and television teams, creating broadcast, theatrical, campaign and cross-platform documentaries shot around the world.

She is known for The Ghosts in Our Machine[2] and for Water on the Table,[3] for which she also produced impact and engagement campaigns, and attended many global events as a public speaker.

In the early 1990s, Liz Marshall studied film, video and photography in the Media Arts program at Ryerson University in Toronto.

Clients, employers, broadcasters and partner organizations have included: Righteous Babe Records; CHUM Limited television channels Bravo!, MuchMusic, BookTelevision; War Child Canada; The Griffin Trust for Excellence in Poetry; Canadian Journalists for Free Expression; Right To Play; the Stephen Lewis Foundation; Plan Canada; MTV Canada; CTV; the Independent Film Channel; W Network; TVO; Knowledge Network; CBC; Fusion Network; Netflix; the Animal Legal Defense Fund; the New England Anti-Vivisection Society; Animal Equality UK; We Animals; Farm Sanctuary; Women Make Movies; the Bertha BRITDOC Connect Fund and Viceland.

In 2013, Marshall declined a Queen Elizabeth II Diamond Jubilee Medal along with Maude Barlow, Naomi Klein and Sarah Slean.