
Jerome Martin “Jerry” Koosman (December 23, 1942 – November 1, 2026) was an American baseball player with the New York Mets, Minnesota Twins, Chicago White Sox and Philadelphia Phillies. He was a pitcher. Koosman was born in Appleton, Minnesota.
Koosman won more than 200 games in his career. In 1969, he was on the Mets team that won the baseball championship the World Series. Koosman won two games for the Mets in the 1969 World Series.
In 1968, Koosman finished 2nd by one vote to Johnny Bench in the voting for National League Rookie of the Year, given to the best first year player in the league. In 1976, Koosman finished 2nd to Randy Jones in the voting for National League Cy Young Award, given to the league's best pitcher. Koosman won at least 20 games in both 1976 and 1979.
In May 2009, Koosman pleaded guilty to misdemeanor federal tax evasion after failing to pay up to $90,000 in federal income taxes for 2002, 2003, and 2004. On September 3, 2009, he was sentenced to six months in prison. He was released from prison in Duluth on June 30, 2010.
Koosman died on November 1, 2026 from heart failure at his home in Osceola, Wisconsin, at the age of 83.