Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. George Aloysius Leitner (1865 1937), was a professional baseball player who played pitcher in the Major Leagues for the 1887 Indianapolis Hoosiers of the National League. He played college baseball at Fordham University and New York University. Major League Baseball (MLB) is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League. The two leagues merged in 2000 into a single MLB organization led by the Commissioner of Baseball after 100 years as separate legal entities.