Hildegard Gertrud Helen Korf Kallmann-Bijl (September 18, 1908 – November 7, 1968) was a German-born physicist with Jewish roots who emigrated to the United States where she founded and was the first chair of Committee on Space Research (COSPAR) in Brussels, Belgium.
[2] Kallmann-Bijl was employed by RAND Corporation in Santa Monica, California (1953–1964), was a guest professor of the observatory at the University of Utrecht (1964) and served as a consultant to the United States Air Force and NASA.
[2] Her models were detailed enough to include atmospheric ranges and Diurnal variation[5] and could also be used to accurately forecast the landing spot of astronauts and cosmonauts.
[7] Some of her correspondence in German and English is held by Leo Baeck Institute at the Center for Jewish History (identifier AR 4692).
[2] She was married twice, first to Curt Kallmann (divorce, 1957), whom she helped flee Germany to Stockholm, Sweden, in 1939 from persecution for his Jewish faith.