Oleg Grabar is Professor Emeritus of the School of Historical Studies at the Institute for Advanced Study, Princeton, and Marilyn Jenkins-Madina is Research Curator of Islamic Art at The Metropolitan Museum of Art, New York. They were both long-time colleagues of Richard Ettinghausen, who was professor of Islamic Art at the Institute of Fine Arts, New York University, and Consultative Chairman of Islamic Art at The Metropolitan Museum of Art until his death in 1979.