Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. John William Clancy (September 15, 1900 in Odell, Illinois September 26, 1968 in Ottumwa, Iowa) was a first baseman in Major League Baseball from 1924-1934. 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.