Born on 4 March 1885 in London, United Kingdom

• 1st Baron of Gleniffer (cr. 1955)
• Arnold Duncan McNair, Kt. Cr. 1943; C.B.E. 1918; Q.C.; F.B.A.
• LL. D. Cambridge; Hon. LL. D. Glasgow, Liverpool, Birmingham, Salonika; Hon.D.C.L., Oxford; Hon. D. Litt., Reading; Fellow of Gonville and Caius Coll; Bencher of Gray’s Inn, Treasurer 1947; Edu: Aldenham; Gonville and Caius College, Cambridge; Admitted solicitor 1906
• Secretary of Advisory Board of Coal Controller, 1917-1919
• Secretary of Coal Industry (Sankey) Commission, 1919
• Chairman, Committee on Supply and Training of Teachers, 1942-1944
• Chairman of Burnham Committee, 1956-1958
• Reader in International Law in the University of London, 1926-1927
• Tagore Professor in the University of Calcutta, 1931
• Whewell Professor of International Law, University of Cambridge, 1935-1937
• Vice-Chancellor, Liverpool University, 1937-1945
• Professor of Comparative Law in University of Cambridge, 1945-1946
• Président de l'Institut de Droit international, 1948-1950
• British member, Permanent Court of Arbitration at The Hague, since 1945
• President of the International Court of Justice, 1952-1955 and Judge, 1946-1955
• President of Curatorium of Hague Academy of International Law, since 1959
• Chairman, Executive Council of International Law Association, since 1959
• President of the Court from 21 January 1959 to 3 May 1965 (elected on 15 September 1959)
• Judge of the European Court of Human Rights from 21 January 1959 to 3 May 1966