John Patrick Kerin (March 3, 1875 â March 16, 1946) was an American professional baseball umpire. He umpired 265 American League games from to . Kerin also umpired in the Eastern League and the Southern League from to .
Kerin spent several seasons in the New England League and Eastern League before his major league service.
After a September 1908 Chicago White Sox game, Kerin suffered a broken nose and was unconscious for a few minutes following a punch by an angry fan. The fan, attorney Robert Cantwell, was known locally for his defense of murder cases. Cantwell was later arrested for the assault.