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William Tatem Quillen (January 15, 1935 – August 19, 2016) was an American politician and jurist from Delaware. He served on the Delaware Supreme Court from 1978 to 1983, and as Secretary of State of Delaware from 1993 to 1994, during the administration of Governor Tom Carper. His older daughter, Carol Quillen, was the first female president of Davidson College. His younger daughter, Tracey Carney, is married to Governor John Carney, and is the current First Lady of Delaware.