Peter Debye: Nazi Collaborator or Secret Opponent?

Abstract

In January 2006, the so-called "Debye Affair" emerged, triggered by the publication of a Dutch book on Einstein. Debye was accused of Nazi collaboration in his capacity as chairman of the German Physical Society when he requested, in December 1938, the remaining Jewish members to leave the society. Within a month, two Dutch universities deleted Debye's name from their research institute and scientific award, and this led, both nationally and internationally, to a heated discussion. The Dutch government commissioned the Netherlands Institute for War Documentation to investigate the case. In its final report, the accusation was toned down to 'opportunism'. This paper is based on new information. Above all, I have researched Debye's extensive American archive. This archive disclosed the correspondence (1940–1963) with his friend Paul Rosbaud, an important MI6 intelligencer in Berlin during the Nazi period. The correspondence, combined with information from other sources, suggests that Debye might have been one of Rosbaud's informants. Therefore, this paper also includes a powerful warning against hasty and definitive conclusions.