He led the museum through competing curatorial arguments, staff strikes, and more, while also getting a massive expansion and a boost to the endowment. But it all began with books, and a close relative: “Mr. Oldenburg — whose older brother is the Pop Art sculptor Claes Oldenburg — was a publishing executive when MoMA hired him to run its publications department in 1969. The job allowed him to work closely with curators and artists on catalogs and books, an experience that proved critical when the board of trustees named him director three years later.”