American art critic, curator, and collector. Papers document Soby's nearly 45-year career in 20th-century art scholarship
and criticism. Materials date from about 1929, when Soby became a partner in Edwin Valentine Mitchell, Inc., booksellers
and publishers, to his retirement from the board of trustees at the Museum of Modern Art, New York in 1975. The bulk of the
collection comprises correspondence from 20th-century artists and photographers, MoMA personnel, curators, critics, friends
and family members.