David T. Prosser Jr. (born December 24, 1942) is a member of the Wisconsin Supreme Court. A former Republican speaker of the Wisconsin Assembly, Prosser was appointed to the court by Governor Tommy Thompson in 1998, and was elected to his first 10-year term without opposition in 2001. He ran for reelection in April 2011 against little-known Wisconsin assistant attorney general, Joanne Kloppenburg.