Taken in Bern, Switzerland, photograph of physicist Leopold Infeld (left) and economist Otto Nathan. Nathan was designated by Albert Einstein as the executor of his estate and co-trustee (with Helen Dukas) of his literary property. The image is in postcard format and stamped on the back: "Alfred Rohrer, Photograph, Bern...Reproduktion Verboten." It's likely that this photograph was taken in conjunction with the conference entitled the "Jubilee of Relativity Theory" that was held in Bern in 1955.