He was born in Neubrandenburg, Germany, "to keen Zionists who named him in honour of Herzl." His doctorate, completed in 1925, was supervised by Hans Rademacher. He spent most of his career at University College London, eventually as a Professor. Heini Halberstam, Klaus Roth and Robert Charles Vaughan were Ph.D. students of his.
- William D. Rubinstein, Michael Jolles, Hilary L. Rubinstein, The Palgrave Dictionary of Anglo-Jewish History, Palgrave Macmillan (2011), p. 260
- Siegmund-Schultze, Reinhard (2009). Mathematicians Fleeing from Nazi Germany: Individual Fates and Global Impact. Princeton University Press. p. 8. ISBN 978-0-691-12593-0.
- Pinl, Max; Furtmüller, Lux (1973). "Mathematicians under Hitler". The Leo Baeck Institute Year Book. 18 (1). doi:10.1093/leobaeck/20.1.370.
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