Here. An excerpt:
WASHINGTON—Six First Nations of British Columbia have taken to the international legal sphere in an effort to shame the Canadian government into recognizing long-standing land claims. Their rationale is simple: We never gave you the land, you took it, so either give us back the land, or give us some other form of remuneration, for stealing and profiting from the plunder.
The First Nations’ efforts were showcased in the capital of the United States on October 28 at a hearing before the Inter-American Commission on Human Rights (IACHR) of the Organization of American States (OAS). The OAS is billed as the world’s oldest regional organization, dating back to 1889, and the IACHR was established in 1960 as a vehicle for the organization to promote and protect human rights.
The unprecedented hearing was granted to the Hul’qumi’num Treaty Group (HTG), which is made up of the Cowichan Tribes, Lake Cowichan First Nation, Halalt First Nation, Penelakut Tribe, Lyackson First Nation and Stz’uminus First Nation. The group accuses the Canadian government of violating the human rights of its 6,400 members by failing to recognize and protect their rights to property, culture and religion as recognized under the OAS’s principal human rights instrument, the American Declaration of the Rights and Duties of Man. Canada has been a member of the OAS since 1989.

Actually that is Seanna Howard, staff attorney at the Indigenous Peoples Law and Policy Program at the University of Arizona law school sitting next to Rob Williams.
True, but the part of the pic you cannot see on the right includes Mr. Thomas.
To the right of Robert Williams is Luschiim Arvid Charlie not Chief Rick Thomas.