Photographer unknown2018-09-212018-09-211932http://172.16.52.76:80/cdm/ref/collection/coll8/id/100https://hdl.handle.net/20.500.12111/1293At the Mt. Wilson Observatory in California, (from l. to r.): Albert Einstein, his assistant, Walther Mayer, and astronomer Charles Edward St. John.SepiaPermission to use this image must be requested from the Institute's Archives. Please contact archives@ias.edu.Einstein, Albert, 1879-1955Mayer, W. (Walther), 1887-1948St. John, Charles E. (Charles Edward), 1857-1935Mount Wilson ObservatoryImage