John J. Cronin, Jr. ("Jack") was born on May 6, 1912, the son of John J. Cronin and Alice Malloy, and lived in Hartford, Connecticut, for most of his life. He had two siblings, Alice and Harold. Alice (d. February 10, 2001) married Edward J. Murray and Harold (d. May 3, 1994) married Mary Tyszka. In 1930, Jack Cronin and a friend, John J. Carlin, Jr., traveled to Atlanta, Georgia, and Durham, North Carolina, in an attempt to join a baseball team; though unsuccessful, Cronin later played amateur baseball around Hartford and participated in the G. I. World Series in Nuremburg, Germany, in 1945. John J. Cronin, Jr., died on January 2, 2002.
From the guide to the John Cronin letters, Cronin, John letters, 1930, (William L. Clements Library, University of Michigan)
