He played in Major League Baseball (MLB) as a right-handed pitcher for the Cincinnati Reds from 1991 to 1993.

[2] He amassed a 44–4 record and twice earned All-State honors pitching at DeSoto High, and led his team to the second State Championship in school history his senior year.

[4] He also earned a Bachelor of Science degree from the University of Wisconsin-Stevens Point in 1998 while serving as an assistant coach with the baseball team (1997–1998).

Foster began the 1992 season with the Reds, but was optioned back to the triple A Nashville Sounds in the beginning of May.

He spent two years at the University of Michigan coaching a baseball camp for college students before returning to the Rays as a scout in 1999 & 2000.

Foster returned to baseball in 2005 as pitching coach for the Florida Marlins' Class A South Atlantic League affiliate, the Greensboro Grasshoppers.

[14] On October 26, 2021, it was announced that Foster would be named the Rockies director of pitching, replacing incumbent Mark Wiley.