Marv "Rotty" Rotblatt.
I was reading up on the history of the sadly extinct bullpen car the other other day, and it turns out Mr. Rotblatt, a Chicago White Sox reliever, made Comiskey Park history (well, sort of) in 1951 when he became the first Sox pitcher ever driven from the bullpen out to the mound. Ah, to live in an era when nobody had ever heard of the phrase "carbon footprint."
The Yankees' bullpen car was retired after 1972 when rats ate through its engine cables. Seriously.