Clayton Thomas-Muller is a member of the Treaty 6 Mathias Colomb Cree Nation, also known as Pukatawagan, located in northern Manitoba. He is an organizer with 350.org, the co-director of the Indigenous Tar Sands Campaign of the Polaris Institute, and a founder and organizer with Defenders of the Land. Clayton is involved in many initiatives to support the building of an inclusive movement globally for energy and climate justice. He serves on the boards of the Global Justice Ecology Project and the Bioneers. He is also a steering committee member of the Tar Sands Solutions Network and development committee member of Idle No More.