Born: November 19, 1876, Kiev, Ukraine.

Died: April 14, 1964, Leiden, Netherlands.

Higher Education: Mathematics and Physics at the Saint Petersburg State University (Saint Petersburg, Russia) and Mathematics at the University of Göttingen (Göttingen, Germany).

Main Publications: 

• P. Ehrenfest & T. Ehrenfest (1911) Begriffliche Grundlagen der statistischen Auffassung in der Mechanik, in: Enzyklopädie der mathematischen Wissenschaften mit Einschluß ihrer Anwendungen. Band IV, 2. Teil ( F. Klein and C. Müller (eds.). Leipzig: Teubner, pp. 3–90. Translated as The conceptual Foundations of the Statistical Approach in Mechanics. New York: Cornell University Press
• T. Ehrenfest-Afanassjewa, Die Grundlagen der Thermodynamik (Leiden 1956)
• T. Ehrenfest-Afanassjewa, On the Use of the Notion “Probability” in Physics Am. J. Phys. 26: pp. 388 (1958)
• Tatjana Ehrenfest-Afanassjewa, “Exercises in Experimental Geometry. 1931″.