In 1945, he supported US Chief-Prosecutor Robert Jackson during the Nuremberg trials. Robinson also prepared the UN Commission on Human Rights. Additionally, he advised the Israeli delegation to the UN. In 1952, Robinson provided his services in drafting the Luxemburg agreement, the first reparation treaty between Israel, the Jewish Claims Commission (JCC) and Germany. Robinson coordinated the efforts of various Jewish organizations that took legal actions against the perpetrators of the Holocaust. His legal expertise was instrumental in the trial of Adolf Eichmann in 1961/62.
Robinson authored numerous studies on international law and the Holocaust. In 1960, together with Philip Friedman, he published the extensive bibliography Guide to Jewish Histor y Under Nazi Impact.