Ohio State University Holocaust Center (under Professor Saul S. Friedman). From October 2002 to January 2003, Kranzler was a Baron Friedrich Carl von Oppenheim Research Fellow for the Study of Racism, Antisemitism, and the Holocaust at Yad Vashem's International Institute for Holocaust Research; the title of his research project was "A Comparative Study on the Worldwide Rescue Effort by Orthodox Jewry During the Holocaust Within the Context of Rescue in General". Research Kranzler became the leading historian on the subject of Jews aiding and rescuing the Jews during the Holocaust, and was among the first to document the efforts of Orthodox Jewish organizations, such as the Vaad Ha-hatzala and Agudath Israel. Historian Alex Grobman referred to him as "the pioneer of research on Orthodox Jewry during the war." Kranzler's books Solomon Schonfeld: His Page in History, co-authored with Gertrude Hirschler, and his later Thy Brother's Blood (1987) were the first to focus on this area. He wrote a paper, "Orthodox Ends, UnOrthodox Means", for American Jewry during the Holocaust (1983), a report organized by the American Jewish Commission, led by Arthur J. Goldberg. Kranzler lectured on the subject in America, Israel, Europe and the Far East. He interviewed and recorded over a thousand people, including some of the major Jewish rescuers, such as Hillel Kook (also known as Peter Bergson), George Mantello, Rabbi Solomon Schonfeld, and close family and associates of rescuers no longer alive, including Rabbi Michael Ber Weissmandl and Recha Sternbuch. He established a research archive of about a million pages and interviews (mostly audio on about 1,000 cassettes) which were at his Brooklyn home. By 1978 the archive held over 10,000 documents on Jewish residents of Shanghai. After Dr. Kranzler's death the archive was transferred to Yad Vashem. In his book Thy Brother's Blood: The Orthodox Jewish Response During the Holocaust (1987), Kranzler argued that more lives could have been saved if American-Jewish leaders had lent more support to efforts in Europe to halt the deportations, including the attempts, in Slovakia and Hungary, to bribe and/or pay ransom to the SS. Criticizing the book's factual accuracy, Efraim Zuroff described it as "an extremely one-sided polemic" and "a popular invective of limited scholarly value". In the view of historian Robert Moses Shapiro, the book's defects, particularly its bitter tone and poor editing, undermined its "important and gripping story". The mid-1944 grassroots protests in Switzerland, including street demonstrations, Sunday