Over 400 pieces of his work are now housed in a collection at the Colby College Museum of Art, which built and dedicated a wing for this purpose. He keeps his ties to Maine, maintaining a summer residence there since 1954. When not in Maine, Mr. Katz lives and works in New York.

Much of this work takes the form of prints, including silkscreens and aquatints; those, as well as his paintings, are of the school of “new realism”, with areas of flat, intense colors.

His work has been exhibited internationally, including retrospectives at the Whitney Museum of American Art in New York and Carnegie Museum of Art in Pittsburgh.