So, who was Grover Whalen?

In the P.  G. Wodehouse novel, Quick Service, we find this quote:
"There may be a certain code in these matters. Either a man is Grover Whalen or he is not Grover Whalen. If he is not, he has no right to wear a moustache like that."

That, of course, raises the question, just who was this legendary fungus-grower who apparently was the preeminent proponent of upper-lip modesty? Grover Aloysius Whalen was a prominent New York business man and politician who lived 1886-1962. He held several appointments during the administrations of Mayors Hylan, Walker and La Guardia. He became known as the official greeter and organizer of many public celebrations, finally gaining the nickname of "Mr. New York."