Doctor of Philosophy in Art History and Philosophy, University Basle, Switzerland, 1933.
Art historian, Paris, France, 1933-1935; various departments, Hallgarten & Company (stock brokers), New York City, 1935-1937; opened, 1937; since partner, Perls Galleries, specializing in modern French paintings, New York City.
Trustee Metropolitan Museum, New York City, 1992. Member Art Dealers Association American (president, director).
Married Amelia Blumenthal, June 30, 1940 (deceased 2002). Children: J. Nicholas (deceased 1987), Katherine Margaret.