[1] Originally signed as an undrafted free agent by the Chicago Cubs in 1961, Pfeil was traded with Hal Gilson to the St. Louis Cardinals for Bob Humphreys on April 7, 1965.

Pfeil made his big league debut at the age of 25 on June 26, 1969, against Philadelphia Phillies pitcher Grant Jackson.

However, when President Nixon attended a World Series game, Pfeil lent him his glove for protection.

In Pfeil's big league career he played in 106 games, collecting 68 hits in 281 at-bats for a .242 batting average.

On February 8, 1972, Pfeil was traded to the Milwaukee Brewers for a player to be named later, who ended up being minor leaguer Chico Vaughns.