What is the origin of food vendors at Major League Baseball?

Answer 1

Harry M. Stevens was one of- and still extant the principal Stadium caterers- they had branches at all the major NYC ballparks, Madison Square Garden, and also- and not strictly speaking sporting- the food concessions at the Now defunct New York Coliseum, site of the Auto shows for many years. Harry M. Stevens also had food conessions at the equally extinct Roosevelt Stadium.