 The collection is the result of an anonymous million dollar 1968 donation in honor of Lieutenant John B. Putnam Jr., of the Princeton Class of 1945, who lost his life in a plane crash during World War II.The collection was assembled in 1969 and 1970 by a committee led by Kelleher and including Alfred H. Barr, Jr. and Thomas Hoving.It contains works by seventeen major twentieth century sculptors, including Alexander Calder, Pablo Picasso, Henry Moore, Louise Nevelson, Isamu Noguchi, David Smith, and Tony Smith.