Clayton Thomas-Muller

Indigenous Tarsands Campaign

Clayton Thomas-Muller is a member of the Mathias Colomb Cree Nation, also known as Pukatawagan in Northern Manitoba, Canada. Based out of Ottawa, Ontario, Clayton is an organizer for the Defenders of the Land and Idle No More, as well as a co-director of the Indigenous Tar Sands (ITS) Campaign of the Polaris Institute.


Clayton is involved in many initiatives to support the building of an inclusive global movement for energy and climate justice. He serves on the board of the Global Justice Ecology Project, Canadian based Raven Trust, and Navajo Nation based Black Mesa Water Coalition.


Clayton has traveled extensively domestically and internationally, having led Indigenous delegations to lobby United Nations bodies, including the UN Framework Convention on Climate Change, UN Earth Summit (Johannesburg, South Africa 2002 and Rio+20, Brazil 2012) and the UN Permanent Forum on Indigenous Issues. Clayton has coordinated and led delegations of First Nations, Native American, and Alaska Native elected and grassroots leadership to lobby government in Washington DC; Ottawa, Canada; and the European Union (Strasbourg and Brussels).


He has been recognized by Utne Magazine as one of the top 30 under 30 activists in the United States and by Yes Magazine as a Climate Hero. For the last eleven years, he has campaigned across Canada, Alaska, and the lower 48 states 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. This has included a special focus on the sprawling infrastructure of pipelines, refineries, and extraction associated with the Canadian tar sands.


Clayton is an organizer, facilitator, public speaker, and writer on environmental and economic justice. He has been published in multiple books, newspapers, and magazines and appeared countless times on local, regional, national, and international television and radio as an expert advocate on Indigenous rights and environmental and economic justice. He has been a guest lecturer at universities, conferences, and seminars around the world.

Contact Clayton at:

Clayton Thomas-Muller
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