The gala marked the social ascent of Koch, who, at the age of seventy, has become one of the city’s most prominent philanthropists. In 2008, he donated a hundred million dollars to modernize Lincoln Center’s New York State Theatre building, which now bears his name. He has given twenty million to the American Museum of Natural History, whose dinosaur wing is named for him. This spring, after noticing the decrepit state of the fountains outside the Metropolitan Museum of Art, Koch pledged at least ten million dollars for their renovation. He is a trustee of the museum, perhaps the most coveted social prize in the city, and serves on the board of Memorial Sloan-Kettering Cancer Center, where, after he donated more than forty million dollars, an endowed chair and a research center were named for him.

One dignitary was conspicuously absent from the gala: the event’s third honorary co-chair, Michelle Obama. Her office said that a scheduling conflict had prevented her from attending. Yet had the First Lady shared the stage with Koch it might have created an awkward tableau. In Washington, Koch is best known as part of a family that has repeatedly funded stealth attacks on the federal government, and on the Obama Administration in particular.

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