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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Paul Ehrenfest (1880-1933), Dutch theoretical physicist, at his desk. 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.
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