Christmas Tree Questions? Ask the Mayor of Rockefeller Center.

For two decades, Correll Jones has been the man to ask about New York’s most famous tree — and where to find the public bathrooms.

For two decades, Correll Jones has been a fixture as the main greeter at a bustling plaza in Midtown Manhattan. His company-issued business card reflects his status: “C.J. mayor of Rockefeller Center.”

And each winter, as countless visitors arrive to see the Christmas tree outside 30 Rockefeller Plaza, Mr. Jones essentially becomes the tree concierge.

In New York City, where doormen traditionally serve as everything from security guard to confidant, Mr. Jones, 59, holds one of the profession’s most prestigious posts. From now until the tree comes down in early January, he will dispense all of the particulars about it to those who ask: that this year’s version is a 79-foot-tall Norway spruce from Maryland decorated with 50,000 lights and a crystal-laden star that weighs nearly a half-ton.