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Albert Einstein was a German-born physicist who developed the special and general theories of relativity and won the Nobel Prize for Physics in 1921 for his explanation of the photoelectric effect. Einstein is generally considered the most influential physicist of the 20th century. In 1909 Einstein became an assistant professor at the University of Zurich, his first full-time physics job. In 1911 he moved on to the German University of Prague. He continued to publish important physics papers, and was beginning to meet fellow scientists, for example, at the exclusive Solvay Conference. The next year he returned to the Federal Institute of Technology in Zurich as Professor.