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1 (of 3) The fifth Solvay International Conference on Electrons and Photons, was held in October 1927. Prominent physicists from all the world met to discuss the newly formulated quantum theory. 17 of the 29 participants were or became Nobel Laureates. Back row, left to right: Auguste Piccard, Émile Henriot, Paul Ehrenfest, Édouard Herzen, Théophile de Donder, Erwin Schrödinger, Jules-Émile Verschaffelt, Wolfgang Pauli, Werner Heisenberg, Ralph Howard Fowler, Léon Brillouin. Middle row, left to right: Peter Debye, Martin Knudsen, William Lawrence Bragg, Hendrik Anthony Kramers, Paul Dirac, Arthur Compton, Louis de Broglie, Max Born, Niels Bohr. Front row, left to right: Irving Langmuir, Max Planck, Marie Skłodowska Curie, Hendrik Lorentz, Albert Einstein, Paul Langevin, Charles-Eugène Guye, Charles Thomson Rees Wilson, Owen Willans Richardson.

Photo: Benjamin Couprie, Institut International de Physique Solvay, Brussels, Belgium. Public domain via Wikimedia Commons

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2 (of 3) Albert Einstein (left) and Hendrik A. Lorentz (right), outside the home of Paul Ehrenfest, Leiden, 1921.

Source: Museum Boerhaave, Leiden Public domain via Wikimedia Commons

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3 (of 3) The Cryogenics Laboratory in Leiden, 1919. From left: Paul Ehrenfest, Hendrik Lorentz, 1922 Nobel Laureate in Physics Niels Bohr and 1913 Nobel Laureate in Physics Heike Kamerlingh Onnes.

Photographer unknown Public domain via Wikimedia Commons