Here are some of his notable books:
* The Art of Assemblage (1961): This book was influential in establishing the art form of assemblage as a legitimate genre within the art world. It examined the works of artists such as Robert Rauschenberg, Jasper Johns, and Kurt Schwitters.
* The World of Henry David Thoreau (1962): This book explored the life and work of the renowned American writer and naturalist Henry David Thoreau.
* The Flamboyant Style (1964): This book focused on the Rococo style of decorative arts in Europe.
* The Taste of Angels: The Private Collections of France in the Eighteenth Century (1972): This work examined the influential private collections of the French aristocracy in the 18th century.
* The Art of the French Court: Louis XIV to Louis XVI (1980): This book provided a comprehensive overview of French decorative arts during the reigns of Louis XIV, Louis XV, and Louis XVI.
Seitz was also a prolific writer for art magazines and journals. He served as the curator of 20th-century design at the Museum of Modern Art (MoMA) in New York City from 1946 to 1955. He was also a professor of art history at Yale University.
His writings are still considered important contributions to the field of decorative arts history. He is remembered for his insightful analyses of art and design, his ability to connect art to its social and historical context, and his engaging writing style.