(1879 – 1955) Physicist whom Time magazine chose as “Man of the Millennium.” German-born Einstein was most famous for his theory of relativity and related re-conceptualizations of physics in the early twentieth century for which he received a Nobel Prize in 1921. When Hitler came into power, Einstein left for the United States, where he accepted a position at Princeton University He had pointed out the possibility of an atomic bomb in the late 1930s, but was not involved in the actual building of the bomb. Instead, he became known as both a pacifist (although not with regard to Hitler) and a Zionist, interests on which he continued to work and speak out until his death.