Jeff Pfeffer was a very good Pitcher for Brooklyn in the 1910s, who, from 1913 to 1914, was one of the more competent players on the mound in the National League.

Pfeffer had only played seven Major League Games before the 1914 Season (two were with the St. Louis Browns in 1911), and would have likely won the 1914 Rookie of the Year, had there been one.  This began a three-year run as a top Pitcher, where he went 66-37 with a 1.99 ERA and a WHIP of 1.081.  Pfeffer helped Brooklyn win the Pennant that year, and though they lost to Boston, with Pfeffer taking a Loss, he was solid in defeat.

Pfeffer slumped in 1917 and was in the Navy in 1918, only playing one Game that year.  Upon his return to the Majors in 1919, he had two good years for Brooklyn, but a poor start in 1921 saw him traded to the Cardinals. 

With the Robins, Pfeffer had a 2.31 ERA with a record of 113 and 80.