High Quality Content by WIKIPEDIA articles! Archibald Clark Kerr, 1st Baron Inverchapel GCMG, PC (17 March 1882, Australia – 5 July 1951), known as Sir Archibald Clark Kerr between 1935 and 1946, was a British diplomat. He served as Ambassador to the Soviet Union between 1942 and 1946 and to the United States between 1946 and 1948.