Albert Einstein (1879–1955) was a German-born physicist known for developing the theories of relativity and the equation E=mc2, significantly impacting the fields of physics and atomic energy. He won the Nobel Prize in Physics in 1921 for his work on the photoelectric effect and later emigrated to the U.S. to escape the Nazis, where he continued his research and became a prominent advocate for civil rights and humanitarian issues. Einstein's legacy includes his significant contributions to science, his influence on modern physics, and his advocacy for social justice.