Timothy Donald Eyman (born December 22, 1965) is an American anti-tax activist and businessman. Since 1997, Eyman has become the most prolific sponsor of Washington ballot measures in its history, having qualified seventeen statewide initiatives. Eleven initiatives were passed by voters, though most of these in turn were later partially or wholly overturned by courts as unconstitutional. His first and most notable success was an initiative preventing affirmative action in Washington State.