Mr. Bankier, who was head of the International Institute for Holocaust Research at Yad Vashem, focused his scholarly work on anti-Semitism, especially its use by the Nazis to promote and sustain a broader ideology. He was the author of “Germans and the Final Solution: Public Opinion Under Nazism” as well as a collection of essays, “Hitler, the Holocaust and German Society: Cooperation and Awareness.”

Born in Germany just before the state of Israel was created, Mr. Bankier grew up and was educated here, earning his doctorate in Jewish history at the Hebrew University of Jerusalem. He held a professorship at Hebrew University and had served as a visiting professor in Britain, the United States, South Africa and South America. He spoke excellent English and Spanish, in addition to German and Hebrew.

Divorced, Mr. Bankier is survived by three children.

A rumpled, somber man who sought to understand the most bewildering aspects of genocide — how someone could play soccer with an acquaintance one day and assist in his murder the next — Mr. Bankier insisted both on the uniqueness of the Nazi Holocaust of six million Jews and on its applicability to other cases of mass murder.

For anti-Semites, “Jews represent mysterious, mythic and evil forces,” he said at a recent lecture, “an omnipotence playing a sinister role in world history.”

At another lecture he noted that for Hitler, “Nazism was a doctrine of world salvation to redeem humanity from the Jewish-Christian-Marxist doctrine. The acquisition and maintenance of total suppression of the German race, Hitler believed, must be through total war of Germans against the Jews.”

At the same time, Mr. Bankier said last year in an interview with The New York Times that the work he was overseeing at Yad Vashem on the role of bystanders and neighbors in numerous smaller mass killings across the former Soviet Union in the early 1940s had important implications for contemporary genocide in Africa and other places.

He argued that the world was a different place as a result of what the Nazis had done, that if genocide in far-off places shocked average people today it was partly because of their knowledge of the details of the Holocaust. In other words, Holocaust deniers aside,
Holocaust awareness was central to contemporary sensibility.

Avner Shalev, chairman of Yad Vashem, said that with Mr. Bankier’s death, the world had lost one of its most important scholars in the field. He noted that Mr. Bankier, who had fought his illness over a long period, kept a regular schedule until his last day.