Secretary Ripley Cutting Anniversary Cake, by Unknown, 1974, Smithsonian Archives - History Div, Eighth Secretary of the Smithsonian Institution S. Dillon Ripley (1964-1984) cuts a cake at his 10th anniversary as Secretary of the Smithsonian party in the Smithsonian Institution Building (SIB), the "Castle," on February 26, 1974. Visible in this photograph are: Waldo LaSalle Schmitt (Honorary Research Associate, Invertebrate Zoology, 1957-1977), Alexander Wetmore (sixth Secretary of the Smithsonian, 1944-1952), Mrs. S. Dillon [Mary] Ripley, and David Challinor (Assistant Secretary for Science, 1971-1985)..