Gregory Joseph O'Halloran (born May 21, 1968) is a Canadian former professional baseball catcher. He played for the Florida Marlins of Major League Baseball (MLB) for 12 games during the 1994 season, serving mostly as a pinch hitter.
Gregory Joseph O'Halloran (born May 21, 1968) is a Canadian former professional baseball catcher. He played for the Florida Marlins of Major League Baseball (MLB) for 12 games during the 1994 season, serving mostly as a pinch hitter. (en)