Keywords: Niels Bohr Albert Einstein by Ehrenfest.jpg Niels Bohr and Albert Einstein The picture was taken at Ehrenfest's home in Leiden the occasion was most likely the 50th anniversary of Hendrik Lorentz' doctorate December 11 1925 http //www dfi dk/dfi/pressroom/kbhfortolkningen/ 1925-12-11 Paul Ehrenfest<br> Original uploader was Graf at http //de wikipedia org de wikipedia This photo is PD in the Netherlands its country of origin Publication information is needed to determine if it is also PD in the U S If this photo was unpublished or not published until 2003 or later then it is considered PD in the U S PD-old Albert Einstein 192512 Niels Bohr 192512 Men facing right Black and white photographs of men Photos by Paul Ehrenfest |