While the uniform looks like it was plucked from the set of a period drama, the St. Regis butlers' job responsibilities have evolved over the years to meet the needs of 21st-century jetsetters.
They still pour coffee and fluff pillows, but the butlers of today - a rarity at modern hotels - are really more like highly educated personal assistants who speak several languages, not the stuffy servants portrayed on TV's Downton Abbey.
"Our guests may travel by private jet, but they're also probably wearing blue jeans and a white T-shirt," Nash said.
Using "e-butler," the hotel's personalized smartphone app, guests can start issuing instructions to their butler before they even check in, whether it's ordering a limousine or a bottle of champagne.
Visitors preparing for an extended stay often want the furniture in their rooms completely rearranged.
One of the most memorable requests came from a guest who wanted her bathtub filled with chlorinated pool water (which the butlers obliged without asking why).
Image: The original 1904 and still functioning mailbox, a prominent feature in the lobby of New York's St. Regis Hotel.