Walter Perry Johnson, nicknamed "Barney" and "the Big Train", was an American professional baseball player and manager. He played his entire 21-year baseball career in Major League Baseball as a right-handed pitcher for the Washington Senators from 1907 to 1927. He later served as manager of the Senators from 1929 through 1932 and of the Cleveland Indians from 1933 through 1935.

Major League Baseball (MLB) is a professional baseball league and the highest level of organized baseball in the United States and Canada. One of the big four major leagues, MLB comprises 30 teams, divided equally between the National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. Formed in 1876 and 1901, respectively, the NL and AL cemented their cooperation with the National Agreement in 1903, making MLB the oldest major professional sports league in the world. They remained legally separate entities until 2000, when they merged into a single organization led by the Commissioner of Baseball. MLB is headquartered in Midtown Manhattan.