Gæsteforsker, Smithsonian Institution, Washington, DC, USA. Desuden forskningsophold ved Harvard University (Cambridge, MA, USA), United Nations Archives, New York (NY, USA), UNESCO Archives, Paris (Frankrig), National Archives, Washington (DC, USA), Library of Congress, Washington (DC, USA), J.F. Kennedy Presidential Library, Boston (MA, USA) samt Woodson Research Center, Rice University, Houston (TX, USA).