He was curator of Islamic and Later Indian art at the Harvard Art Museum, and from 1979 to 1987, he was also special consultant for the department of Islamic art at the Metropolitan Museum of Art.
Ia menjadi kurator seni rupa Islam dan kemudian India di Harvard Art Museum, dan dari 1979 sampai 1987, ia juga menjadi konsultan khusus untuk departemen seni rupa Islam di Metropolitan Museum of Art.