Joffre in Washington - Glass negative photogrpah. Public domain.

Photograph shows from left to right: William Wright Harts (1866-1961), military aide to President Woodrow Wilson; Frank Lyon Polk (1871-1943), counselor for the United States Department of State; Franklin D. Roosevelt (1882-1945), Assistant Secretary of the Navy; Robert Lansing (1864-1928), United States Secretary of State; Marshal Joseph Jacques Césaire Joffre, (1852-1931) French General; Hugh Lenox Scott (1853-1934), Chief of Staff of the United States Army; René Viviani (1863-1925), former Prime Minister of France; and Jean Jules Jusserand (1855-1932), French Ambassador to the United States. (Source: Flickr Commons project, 2015 and The New York Times, April 26, 1917)