Findlay is a Director of Acquavella Galleries,[1] which specializes in Impressionist and Modern European works of art as well as Post-War American painting and sculpture.

He curated major exhibitions in its uptown galleries, first at 24 East 81st Street, then at 27 East 79th Street, including "The Artists Collect" in 1964,[3] a group show featuring Robert Rauschenberg, Robert Indiana, Tom Wesselmann, John Willenbecher, Lee Bontecou, George Segal, Roy Lichtenstein, Jack Youngerman, Jasper Johns, Arman, Marisol, Robert Bücker, and Ellsworth Kelly; a 1965 display of Bridget Riley's Op Art paintings, coinciding with the Museum of Modern Art's show The Responsive Eye; and “Words” in 1967,[4] a thematic show of text-based art, which featured the work of Joseph Cornell, Enrique Castro-Cid, Marcel Duchamp, Oyvind Fahlstrom, Robert Indiana, Jasper Johns, Ray Johnson (who helped organize the show), Paul Klee, Roy Lichtenstein, Robert Rauschenberg, Peter Saul, and Kurt Schwitters.

This group exhibition featured John Baldessari, Carol Brown, David Milne, Ralph Pomeroy running from October 12–November 16, 1968.

[6] He gave American artists Hannah Wilke,[7] John Baldessari,[6] Stephen Mueller and Billy Sullivan their first solo exhibitions in New York.

During his tenure at Christie's he was instrumental in the sale of various important collections, including Mr. and Mrs. Paul Mellon, Victor and Sally Ganz and Hal B. Wallis.

In 1990, he supervised the sale of Dr. Gachet by Vincent Van Gogh for $82,500,000, which at the time was the highest price paid for a work of art at auction.

He is a contributing author of The Expert versus The Object: Judging Fakes and False Attributions in the Visual Arts, edited by Ronald Spencer and published by Oxford University Press in 2004.