At NPG with Portrait of Thayendanega, by Maciolek, Robert, 1976, Smithsonian Archives - History Div, Standing with the portrait of Thayendanega (Joseph Brant) by Gilbert Stuart are (left to right) National Portrait Gallery Director Marvin Sadik (1969-1981), the Duke of Northumberland Ralph Percy, Chancellor and Chief Justice Warren E. Burger, and Secretary of the Smithsonian (1964-1984) S. Dillon Ripley. Stuart painted the portrait of Thayendanega, Chief of the Mohawks, in London in 1798. The visit occured in July..