Ann Arbor is a city in the U.S. state of Michigan and the county seat of Washtenaw County. Ann Arbor was founded in 1824, named for wives of the villages founders and the stands of Bur Oak trees. The University of Michigan moved from Detroit to Ann Arbor in 1837, and the city grew at a rapid rate in the early to mid-20th century. During the 1960s and 1970s, the city gained a reputation as a center for left-wing politics. Ann Arbor became a focal point for political activism and anti-Vietnam War movement, as well as various student movements. Ann Arbor is home to the University of Michigan, one of the foremost research universities in the United States. The university shapes Ann Arbors economy significantly as it employs about 30,000 workers, including about 12,000 in the medical center. The citys economy is also centered on high technology, with several companies drawn to the area by the universitys research and development infrastructure, and by its graduates.