Albert Einstein  ( 14 March 1879 – 18 April 1955) was a theoretical physicist. Albert Einstein was born in Ulm, in the Kingdom of Württemberg in the German Empire on March 14, 1879. His father was Hermann Einstein, a salesman and engineer. His mother was Pauline Einstein . In 1880, the family moved to Munich, where his father and his uncle founded Elektrotechnische Fabrik J. Einstein & Cie, a company that manufactured electrical equipment based on direct current. Einstein is best known for his theories of special relativity and general relativity. He received the 1921 Nobel Prize in Physics "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect." Einstein published more than 300 scientific and over 150 non-scientific works. He is often regarded as the father of modern physics.