“Adding to doubts about his institution’s direction, Leonard Riggio, the [New York-based] Dia Art Foundation’s biggest benefactor, has decided to step down as chairman of its board… The decision comes as the institution is reeling from the loss of Michael Govan, its director for 12 years, who resigned in February to run the Los Angeles County Museum of Art. And six weeks ago, Dia lost its vice chairman, Ann Tenenbaum. She resigned after 12 years on the board, saying she was stretched too thin by family responsibilities and board commitments at other arts institutions.”