Bill Plummer was a professional baseball player who played as a catcher for various teams during his career. He was born on March 21, 1947, in Oakland, California, and attended Fremont High School in Sunnyvale, California. Plummer was drafted by the Cincinnati Reds in the 25th round of the 1968 Major League Baseball draft.

Plummer made his Major League debut on September 6, 1968, for the Cincinnati Reds. He played for the Reds until 1970, when he was traded to the Seattle Pilots. He played for the Pilots in 1969 and then for the Milwaukee Brewers in 1970. In 1971, Plummer was traded to the Boston Red Sox, where he played for one season.

In 1972, Plummer signed with the San Diego Padres, where he played for two seasons. He then played for the Detroit Tigers in 1974 and the San Francisco Giants in 1975. Plummer returned to the Padres in 1976 and played for them until 1978. He then played for the Oakland Athletics in 1979 and the Seattle Mariners in 1980.

Plummer's best season was in 1977, when he hit .244 with 10 home runs and 43 RBIs for the Padres. He was known for his defensive skills as a catcher and was a reliable backup catcher throughout his career.

After his playing career, Plummer became a coach and manager in the minor leagues. He managed the Seattle Mariners' Triple-A affiliate, the Tacoma Rainiers, from 1993 to 1995. He also managed the San Francisco Giants' Double-A affiliate, the Shreveport Captains, in 1996 and the Giants' Triple-A affiliate, the Phoenix Firebirds, in 1997.

Plummer was also a coach for the Giants, serving as their bullpen coach from 1998 to 2002. He then became a scout for the Giants, a position he held until his retirement in 2012.

In conclusion, Bill Plummer had a long and successful career in professional baseball as a catcher. He played for various teams during his career and was known for his defensive skills. After his playing career, he became a coach and manager in the minor leagues and a scout for the San Francisco Giants.