Leonard Lauder runs the Whitney Museum. No, that’s not strong enough: Leonard Lauder is the Whitney Museum. “As chairman of the Whitney for the last 14 years, he has run the museum like a family business, deploying his considerable resources and connections on its behalf, regularly scribbling suggestions to staffers on his blue personal stationery. It is a hands-on approach that makes it hard to tell where he ends and the museum begins.” But that warm-and-fuzzy one-man management is making things difficult for the Whitney at a time when other New York museums are grabbing the spotlight and the dollars that come with it. Questions abound, not the least of which is whether the Whitney can survive Lauder’s eventual departure.