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| 1883 August 16 | Born, Los Angeles, California
Attended Los Angeles Military Academy Attended Pomona College |
| 1907 | Graduated, Ecole Libre des Sciences Politiques, Paris |
| 1908 | Took the Diplomatic Service Examination |
| 1908-1909 | Secretary, American Legation, Tegucigalpa, Honduras |
| 1909-1910 | Second Secretary, American Embassy, London |
| 1910 | Private secretary to the Assistant Secretary of State, Washington |
| 1911 | Clerk, Department of State, Washington |
| 1911-1913 | Secretary, American Legation, Havana, Cuba |
| 1913 | Observer, elections for Constituent Assembly of Santo Domingo |
| 1914-1916 | Secretary, American Legation, Brussels
Liaison between Herbert Hoover and the Belgian Government for the Commission for Relief in Belgium |
| 1916 | First Secretary, American Embassy, London |
| 1917 | Assigned to State Department -War Missions
Author, A Journal from Our Legation in Belgium Aide to Lord Balfour, British Minister of Foreign Affairs, during visit to the U.S Attached to Belgian War Mission during visit to the U.S. |
| 1918 | First Secretary, American Embassy, Paris
Advisor to General Pershing |
| 1918-1919 | Member, Interallied Mission to Countries of former Austro-Hungarian Empire |
| 1919-1924 | Envoy Extraordinary and Minister Plenipotentiary to Poland (Warsaw) |
| 1922 | Married Ynes Reyntiens, Brussels |
| 1924 | Attended Temporary Mixed Commission for the Reduction of Armaments, League of Nations, Geneva
Maintained as Ambassador-at-Large, League of Nations |
| 1924-1927 | Envoy Extraordinary and Minister Plenipotentiary to Switzerland (Bern) |
| 1925 | Vice-Chairman, American Delegation, Arms Traffic Conference, Geneva |
| 1926-1930 | Chairman, American Delegation, Preparatory Commission for the Disarmament Conference, Geneva |
| 1927 | Delegate, Conference on Private Manufacture of Arms, Geneva
Chairman of American delegation and conference, Conference for the Further Limitation of Naval Armaments (also called Tripartite Naval Conference or the Three Power Conference), Geneva |
| 1927-1933 | Ambassador Extraordinary and Plenipotentiary to Belgium and Envoy Extraordinary Minister Plenipotentiary to Luxemburg (Brussels) |
| 1928 | Doctor of Diplomacy and Political Science, Universite Catholique de Louvain |
| 1929 | Birth of son Michael Francis, Brussels |
| 1930 | Delegate, London Naval Conference
Doctor of Law, Universite Libre de Bruxelles |
| 1931 | Doctor of Law, Yale University
Observer, Conference of Experts for a Moratorium on Intergovernmental Debts (also called the London Conference or the International Conference of Ministers), London |
| 1932-1933 | Acting Chairman, American Delegation, General Disarmament Conference, Geneva |
| 1933-1937 | Ambassador Extraordinary and Plenipotentiary to Brazil (Rio de Janeiro) |
| 1935 | American Representative, Mediatory Group to end the Chaco War between Bolivia and Paraguay Delegate, Chaco Peace Conference, Buenos Aires |
| 1937 | Author, Rio |
| 1937-1938 | Ambassador Extraordinary and Plenipotentiary to Belgium and Envoy Extraordinary and Minister Plenipotentiary to Luxemburg (Brussels) |
| 1938 | Retired from foreign service |
| 1939 | Author,
Belgium: The Country and Its People
Vice-President, Belgian American Educational Foundation Chairman, A.R.A. Association |
| 1940 | Escaped from France during German occupation
European representative for the National Committee on Food for Small Democracies |
| 1940-1941 | Director General for Europe of the Commission for Polish Relief and the Commission for Relief in Belgium |
| 1942 | Author, The Problems of Lasting Peace (with Herbert Hoover) |
| 1944 | Author, The Road to Foreign Policy |
| 1945 | Author, The Basis of Lasting Peace (with Herbert Hoover) |
| 1946-1947 | Member, Herbert Hoover Food Mission (Herbert Hoover, Chairman) |
| 1947 | Member, Investigatory Committee for postwar German economic policies |
| 1950 | Death of Ynes R. Gibson |
| 1952 | Director, Provisional Intergovernmental Commission on Movements of Migrants from Europe (ICEM) |
| 1954 December 12 | Death of Hugh Simons Gibson, Geneva |