The term 'Speaker of Baseball' is a reference to Tris Speaker, an American baseball player who played for the Boston Red Sox and Cleveland Indians from 1907 to 1928. He was known for his exceptional batting and defensive skills, and was inducted into the Baseball Hall of Fame in 1937. Speaker was also a manager for the Indians and Washington Senators, and was nicknamed 'The Grey Eagle' due to his grey hair and dignified manner. He is widely regarded as one of the greatest players in baseball history.