William C. Seitz
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William Seitz (June 14, 1914 – October 26, 1974) was an American art curator associated most closely with the Museum of Modern Art (MoMA) in New York City and known for the landmark exhibitions he curated and wrote catalogue essays for there on assemblage, "The Art of Assemblage" (the first time the term assemblage was introduced into popular parlance[1]) and OpArt (1965's "The Responsive Eye") with his accompanying essays published in the exhibitions' catalogue.[2][3]