EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Dutch physicists Paul Ehrenfest (1880-1933. Johannes Kuenen (1866-1922, right), with Ehrenfest's wife, Russian-Dutch mathematician Tatyana Afanasyeva (1876-1964). Ehrenfest worked on quantum theory and was a contemporary of Einstein, who lauded him as the best teacher of physics he had ever known. He was responsible for the theory of phase transition and the Ehrenfest theorem. Kuenen discovered retrograde condensation of gases.
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