William Francis Plummer (born March 21, 1947 in Oakland, California) was a catcher for the Chicago Cubs, Cincinnati Reds, and the Seattle Mariners. While never a regular player (he was Johnny Bench's backup catcher during the Big Red Machine years), he did play solid defense with a .983 Fielding percentage. He was a lifetime .188 hitter (he only batted above .200 three times in his career).
After he retired, he stayed in the Mariners system. He managed the Wausau Timbers in 1981. He was the Mariners' third base coach, and when Jim Lefebvre was fired after the 1991 season, he was hired as manager. The Mariners finished in last place in his only season in Seattle, going 64-98.
Plummer has managed in both independent and minor league baseball having managed the Western Baseball League's Chico Heat from 1997–1999. In 2000, he joined the Arizona Diamondbacks' minor-leagues system, eventually working his way up to their Triple-A affiliate, the Tucson Sidewinders, whom he managed in 2007-2008. The team moved to Reno and became the Reno Aces in 2009, with Plummer being replaced as manager by Brett Butler. Plummer served as the minor league catching coordinator for the Diamondbacks from 2009 to 2012. He managed the Naranjeros de Hermosillo of the Mexican Pacific League for parts of the 2010 and 2011 seasons, taking them to the playoffs in 2010. He now manager of the Visalia Rawhide of the California League.
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