Albert Einstein (March 14, 1879 to April 18, 1955) was a German
mathematician and physicist who developed the special and general
theories of relativity. In 1921, he won the Nobel Prize for physics for
his explanation of the photoelectric effect. In the following decade, he
immigrated to the U.S. after being targeted by the Nazis. His work also
had a major impact on the development of atomic energy. In his later
years, Einstein focused on unified field theory. By November 1915, Einstein completed the general theory of relativity. Einstein considered this theory the culmination of his life research. With his passion for
inquiry, Einstein is generally considered the most influential physicist
of the 20th century.