John Aloysius McKeon, nicknamed "Trader Jack", is a former Major League Baseball manager.
McKeon played baseball for the College of the Holy Cross.
In 2003, he won a World Series with the Florida Marlins.
When he took over as manager of the Marlins in 2011 at age 80, he became the second oldest manager in major league history, behind only Connie Mack.
McKeon previously managed the Kansas City Royals from 1973 to 1975, the Oakland Athletics in 1977 and 1978, the San Diego Padres from 1988 to 1990, and the Cincinnati Reds from 1997 to 2000.
From 1981 to 1990, he served as general manager of the Padres, forming the team which won the 1984 National League pennant.