Ken Griffey Sr. is a former professional baseball player and coach. Griffey made his MLB debut on August 25, 1973, with the Cincinnati Reds. That season, Griffey played in only 25 games, but batted .384 with three homers. The following season, Griffey saw more playing time with 88 games.

He played in the MLB as an outfielder from 1973 through 1991, most notably as a member of the Cincinnati Reds dynasty that won three division titles and two World Series championships between 1973 and 1976. He also played for the New York Yankees, Atlanta Braves and the Seattle Mariners. In 1975, Griffey began to break out with a .305 batting average with four home runs and 46 RBIs. Griffey's best season came in 1976, when he came just short of winning the batting title behind Bill Madlock of the Chicago Cubs. A three-time All-Star, Griffey hit over .300 five times in his role as the table-setter for the powerful Cincinnati batting order that was known as the Big Red Machine and their dominance of the NL in the mid-1970s. 

In 2004, Griffey was inducted into the Cincinnati Reds Hall of Fame. He is the father of National Hall of Fame outfielder Ken Griffey Jr. As of 2021, Griffey Sr.'s grandson, Trey, is a wide reciver on the Pittsburgh Steelers.