Although he was born in Germany and did some of his early work there, Albert Einstein did much of his work in Switzerland while working at the Swiss Patent Office. He also did some of his later work in the United States and lectured across Europe, America and the Far East.
Einstein began his education in Germany, but he received training to be a mathematics and physics teacher at the Swiss Federal Polytechnic School in Zurich. He then achieved Swiss citizenship and became a technical assistant at the patent office, where he published theories of physics and Newtonian mechanics. He then became a professor in Germany. In 1916 in Berlin, Einstein came up with the theory of gravitation and of relativity. He also worked on theories of radiation and statistics. Einstein was also a professor in the United States, where he worked on unified field theories and quantum theories.