Since the early 1960s, Wilma and Georg Iggers have had intensive contacts, especially with people from the Resistance against the Nazi Regime, in Göttingen. Later, they also had a second home in Göttingen and usually spent half of the year there. At the Max-Planck-Institute for History, Georg Iggers had a large number of scientific contacts and working stays.
Since the mid-1970s, Georg Iggers had been developing a partnership between the universities in Buffalo, N.Y., and Darmstadt with the Darmstadt TH President, the historian Helmut Böhme. Furthermore, he maintained a lively exchange of views with well-known German historians over the decades.
The contact with the director of the Institute for Migration Research in Osnabrück, Prof. Klaus Bade, resulted in the publication of the double biography of Wilma and Georg Iggers. In 2006, Georg is awarded an honorary doctorate by the TU Darmstadt for his services and scientific achievements in the field of international history of historiography.