Born in Warwick, Rhode Island, Foster attended Bishop Hendricken High School and Providence College and played at catcher on the Providence Friars baseball team under Paul Kostacopoulos, where he was named MVP of the 1992 Big East Conference baseball tournament.

Foster served as head baseball coach at the University of Rhode Island from 2006 to 2014, compiling a record of 268–230–3.

[7] Following a 13–40 season, Foster resigned on July 17, 2014, with three years remaining on his contract to accept the associate head coach job with Boston College.

[9][10][11] Foster was named head baseball coach at the United States Military Academy on June 23, 2016.

[20] On July 13, 2023, Foster was fired after an investigation by the university human resources department revealed “bullying and a toxic environment within the program".