; 14 March 1879 â 18 April 1955) was a German-born theoretical physicist. He developed the general theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics). Einstein's work is also known for its influence on the philosophy of science.lbert Einstein was born in Ulm, in the Kingdom of Wuerttemberg wÃ¼rttemberg in The German empire on 14 march. 1879 his parents Were Hermann, einstein a salesman and, engineer And Pauline. koch