Hendrik Casimir
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Hendrik Brugt Gerhard Casimir was a Dutch physicist who made significant contributions to the field of quantum mechanics and quantum electrodynamics. He is best known for his work on the Casimir effec
Casimir in 1958
Paul Ehrenfest
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Paul Ehrenfest was an Austrian theoretical physicist who made major contributions to statistical mechanics and its relation to quantum mechanics, including the theory of phase transition and the Ehren
Hendrik Casimir
…superconductors (together with C. J. Gorter) in 1934. Casimir was born 15 July 1909. He studied theoretical physics at the University of Leiden under Paul Ehrenfest, where he received his Ph.D. in 1931. His Ph.D. thesis dealt with the quantum mechanics of a rigid spinning body and the group theory of the rotations…
Ehrenfest, c. 1910s
Ehrenfest's students, Leiden 1924. Left to right: Gerhard Heinrich Dieke, Samuel Abraham Goudsmit, Jan Tinbergen, Paul Ehrenfest, Ralph Kronig, and Enrico Fermi
Niels Bohr and Albert Einstein debating quantum theory at Ehrenfest's home in Leiden (December 1925).