Ronald Lauder is chairman emeritus of the Museum of Modern Art, former treasurer of the World Jewish Congress and, most important, a major advocate of Holocaust-era art restitution. But “despite his high-profile advocacy for openness — including testimony before Congress in 1998 — Lauder has never publicly listed the works in his own collection, many of which are by painters who were popular with Jewish collectors before the Holocaust. And a museum that he founded has failed to fulfill its pledge to post provenance information for its collection.”