Clarence Jackson, Sr. was a merchant and commercial fisherman from Kake, Alaska. He was one of the five incorporators of Sealaska, and served as Sealaska Director. Jackson served as President and Chairman of the Board of the Southeast Native Timber Corporation, as a director of the Kake Tribal Corporation, Vice President of the Kake IRA Council, President of Southeast Alaska Community Action Program, Area Vice President of the National Congress of American Indians, and Commissioner of the Tlingit and Haida Regional Housing Authority. Jackson also served on the Board of Advisors for Sheldon Jackson College, and on the Fisheries Advisory Board for the Kake area.