Photographer unknown2018-09-212018-09-21circa 1920http://172.16.52.76:80/cdm/ref/collection/coll8/id/98https://hdl.handle.net/20.500.12111/1155Albert Einstein in the Amsterdam laboratory of Pieter Zeeman, who is standing on Einstein's right. The person on Einstein's left is Paul Ehrenfest. The photograph dates to about 1920. Description on photograph's back: "f.l.t.r. P. Zeeman, 1865-1943, Einstein, P. Ehrenfest (1880-1933) [?in] Zeeman’s laboratory at Amsterdam, 1920?“B&WPermission to use this image must be requested from the Institute's Archives. Please contact archives@ias.edu.Ehrenfest, Paul, 1880-1933Einstein, Albert, 1879-1955Zeeman, Pieter, 1865-1943Image