Since 1982, Williams has served as a Fisheries and Natural Resources Commissioner for The Tulalip Tribes. In this role, he directs pre-season fisheries negotiations, governmental planning and cooperative habitat management. Since 1985, Williams has served on the Northwest Indian Fisheries Commission and represented the Tulalip Tribes on the Pacific Fisheries Management Council. He has also served on the Pacific Salmon Commission since 1997.
Appointed by Environmental Protection Agency (EPA) administrator Carol Browner, Williams served as the director of the EPA American Indian Environmental Office in Washington, D.C. from 1995 to 1996. From 2003 to 2004, Williams served as Chair of the Tribal Committee of the National Environmental Justice Advisory Committee. In 1997, Williams represented indigenous peoples on the U.S. delegation to the United Nations Conference on Biodiversity.
Williams currently serves on the Salmon Homecoming Alliance Board and the Northwest Straits Commission. He is also a member of the Snohomish Basin Salmon Recovery Forum, a multi-interest coalition that guides salmon conservation efforts in the Snohomish River basin. The forum is developing a local salmon conservation plan and prioritizing critical restoration project. Williams has also served on the Puget Sound Water Quality Authority, the Center For Streamside Studies, Adopt-A-Stream Foundation and the Native American Fish and Wildlife Society. Williams has received the Washington State Environmental Award and the Seventh Generation Legacy Award for his work.