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Dr. Welu taught at Clark and at the Worcester Art Museum for several years before joining the museum staff as an assistant curator in 1974. He served as the chief curator from 1980 to 1986 before becoming the director. He served in this position for twenty-five years. Welu retained oversight of Old Master paintings and taught on a continuous basis.
A specialist in 17th-century Dutch and Flemish painting and cartography, Welu organized many exhibitions including Judith Leyster: A Dutch Master and Her World, the first show of the most famous woman artist from Holland’s Golden Age. In 2007 Hope and Healing: Painting in Italy in a Time of Plague, 1500-1800 was the first exhibition in North America to examine the response of the visual arts to the plague. He lectured widely and wrote such books as 17th Century Dutch Painting: Raising the Curtain on New England, Judith Leyster: A Dutch Master and Her World, The Collector's Cabinet: Flemish Paintings from New England, and Mask of Mirror.
Welu served as president of the Association of Art Museum Directors and chaired the Accreditation Commission of the American Association of Museums. He was also a member of the advisory council for the art museum at Princeton University and the Snite Museum of Art at the University of Notre Dame.
"Museum to Host Director," Telegraph Herald, January 17, 2012