born Gottlieb Doering
also known as Jack Brennan and John Doering
- Bats Unknown, Throws Unknown
- Debut April 20, 1884
- Final Game October 4, 1890
- Born September 15, 1863 in St. Louis, MO USA
- Died March 24, 1914 in Koch, MO USA
"He stands high in his position and is a good man." - Sporting Life, March 26, 1892, about Jack Brennan and his catching ability
"Jack has shown himself to be one of the best catchers in the League, and is the very man for young pitchers. He plays all over the field, and keeps his head in every instance." - Sporting Life, June 29, 1895, about Jack Brennan in the Virginia State League
Jim Brennan was born Gottlieb Doering in St. Louis, MO, but was known during his playing career as Jim or Jack Brennan. He was listed in the 1900 Census as "John Doering, baseball umpire" and in the 1910 Census as "John Brennan", living both times at the same address in St. Louis.
Brennan played seven different positions in four different major leagues in the five years he played in the big leagues.
In later years he was a minor league umpire. He umpired two games in the American Association in 1888, although he is not to be confused with another Jack Brennan, a contemporary whose umpiring career in the major leagues was longer. In 1891 it was reported that he also had a job wherein "he makes books in pool room".
- "Jack Brennan", in Bill Carle, ed.: Biographical Research Committee Newsletter, SABR, May/June, 2008, p. 1.