Brennan attended
Mercer University and was signed as an undrafted free agent by the
Los Angeles Dodgers on September 1, 1984. He played for the
Vero Beach Dodgers (1985),
San Antonio Dodgers (1986) and
Albuquerque Dukes (1987–1988) before making his major league debut with the Dodgers on July 19, 1988, as a starting pitcher against the
St. Louis Cardinals. Brennan worked innings, gave up three runs and took the loss. He appeared in four games for the Dodgers during their championship year of 1988, making two starts. Brennan was back with the Dukes for 1989 and then moved around, playing for the
Tucson Toros (
Houston Astros),
Harrisburg Senators (
Montreal Expos),
Toledo Mud Hens (
Detroit Tigers) and
Iowa Cubs, before getting another chance in the bigs with the
Chicago Cubs in 1993. He pitched in eight games, making one start in '93. After one more season with Iowa, he was out of baseball after the 1994 season. ==References==