 The commission was Mills' last major role in professional baseball.Having long spent his career working for the Hale Elevator Company of Chicago, Mills became vice-president of one of its agents—the Otis Elevator Company—in 1898 and held the position until his death.In his later years, Mills was involved in amateur athletics, becoming the director and president of the New York Athletic Club and in 1921, penned the American Olympic Association constitution.