Designed by Heidi Leech, this colophon highlights the artists and print studios who collaborated on the Leo Castelli 90th Birthday Portfolio. All nine artists who contributed prints (Jasper Johns, Ellsworth Kelly, Joseph Kosuth, Roy Lichtenstein, Bruce Nauman, Robert Rauschenberg, James Rosenquist, Ed Ruscha, and Richard Serra) had been represented by the Leo Castelli Gallery, New York, at some point in their careers. Many of the prints’ titles contain Castelli’s first name or initials; all of them seem to provide clues into the gallerist’s relationships with his artists, underscoring the personal significance of these professional connections.