He taught art history at Parsons School of Design from 1977 through 1990[1] and is author of numerous articles and exhibition catalogues, including New York Dada 1915-25 (Harry N. Abrams, 1994) and Marcel Duchamp: The Art of Making Art in the Age of Mechanical Reproduction (Harry N. Abrams, Inc. 1999).
In 1996, he organized "Making Mischief: Dada Invades New York" for the Whitney Museum of American Art, in 1997, "Beatrice Wood: A Centennial Tribute" for the American Craft Museum in New York, and, in 2003, he co-curated "Conversion to Modernism: The Early Work of Man Ray" for the Montclair Art Museum.
[2] For nineteen years—from 2001 to 2020—he operated the Francis Naumann Fine Art gallery in New York City which showed the work of artists Marcel Duchamp, Beatrice Wood and Man Ray.
[4] His writings on Marcel Duchamp were published as The Recurrent, Haunting Ghost: Essays on the Art, Life and Legacy of Marcel Duchamp (New York: Readymade Press, 2012).
In 2019, his autobiographical account of his relationship with art historians Leo Steinberg and John Rewald (among others) and the artist Beatrice Wood was published as MENTORS: The Making of an Art Historian (Doppelhouse Press).