William Grawn Milliken (March 26, 1922 – October 18, 2019) was an American businessman and politician who served as the 44th governor of Michigan. A member of the Republican Party, he is the longest-serving governor in Michigan history, serving more than three full four-year terms from 1969 to 1983. During this period he dealt with dramatic changes to the state economy, due to industrial restructuring and challenges to the auto industry, resulting in loss of jobs and population from Detroit, the state's largest city. He also oversaw the PBB crisis and adopted a policy of environmental protection and conservation.