David H. Kranzler (May 19, 1930 – November 29, 2007) was an American professor of library science at Queensborough Community College, New York, who specialized in the study of the rescue of Jews during the Holocaust. Kranzler was the author of several books on the topic, including Thy Brothers' Blood: The Orthodox Jewish Response During the Holocaust (1987) and The Man Who Stopped the Trains to Auschwitz: George Mantello, El Salvador, and Switzerland's Finest Hour (2000), Heroine of Rescue: The Incredible Story of Recha Sternbuch Who Saved Thousands from the Holocaust (co-authored with Joseph Friedenson). Early life and education Kranzler was born in Germany, one of seven children, to Yerachmiel and Chana Kranzler of Würzburg. His family emigrated to the United States in 1937 to avoid Nazi persecution, and he was raised in Brooklyn, New York. He studied at the Yeshiva Torah Vodaath in Williamsburg, Brooklyn and in 1953 he obtained his BA from Brooklyn College, followed by an MA in 1958, also from Brooklyn, and an MLS degree in 1957 from Columbia University. In 1971 Kranzler was awarded a doctorate by Yeshiva University, for a thesis entitled The History of the Jewish Refugee Community of Shanghai: 1938–1945, the result of a seven-year study of the 17,000 Jews who fled to Shanghai from Nazi Germany. His dissertation mentor was Dr. Abraham G. Duker. Duker, who had prepared his own dissertation under Salo W. Baron at Columbia University, was University Professor of Jewish History and Social Institutions and Director of Libraries at Yeshiva from 1962 to 1972, and a long-time editor of Jewish Social Studies. Kranzler's manuscript was published by Yeshiva University Press in 1976 as Japanese, Nazis & Jews: The Jewish Refugee Community of Shanghai, 1938–1945. Reviewing the book for The American Historical Review, Leona S. Forman called it a "painstaking documentation of a vignette in Jewish history". Career Positions held After working as a school librarian, Kranzler joined the faculty of Queensborough Community College (QCC) of the City University of New York in 1969, and was a professor in the library department until his retirement in 1988. He was one of the founders and the first director of QCC's Holocaust Resource Center and Archives. He served as scholar-in-residence in numerous congregations, college campuses, and centers, including the Spanish-Portuguese Synagogue (under Rabbi Marc D. Angel) in Manhattan; Kodima Synagogue in Springfield, Massachusetts (under his brother-in-law Rabbi Alex Weisfogel); and the