In 1947 Halsman made what was to become one of his most famous photos of a mournful Albert Einstein, who during the photography session recounted his regrets about his role in the United States pursuing the atomic bomb. The photo would later be used in 1966 on a U.S. postage stamp and, in 1999, on the cover of Time magazine, when it called Einstein the "Person of the Century." (https://en.wikipedia.org/wiki/Philippe_Halsman)