Leslie Mann was a professional baseball player who played outfield in the Major Leagues from 1913-1928. After retiring as a player, Mann became an advocate for baseball as an international sport. He founded the U.S.A. Baseball Congress. Mann went on to found the International Baseball Federation, which organized an international championship in England in 1938. The English team, composed mainly of Canadian college players, won 4 out of 5 games against an amateur American team. He also organized subsequent championships in Cuba in 1939 and Puerto Rico in 1941. World War II brought Mann's efforts to an end.
From the description of Leslie Mann Correspondence 1929 - 1947. 1947. (National Baseball Hall of Fame). WorldCat record id: 654853395
