Clayton Thomas-Müller is a Cree activist and writer, a member of the Treaty #6 based Mathias Colomb Cree Nation, aka Pukatawagan, located in Northern Manitoba, Canada. He has campaigned across Turtle Island organizing in hundreds of First Nations, Alaska Native, and Native American communities in support of grassroots Indigenous Peoples to defend against the encroachment of the fossil fuel industry, including a special focus on the pipelines, refineries, and extraction associated with the Canadian tar sands. His memoir, Life in the City of Dirty Water published in 2021, shares its name with a short documentary film by Thomas-Müller and Spencer Mann. The book was selected for the 2022 edition of Canada Reads.