: Physicist Albert Einstein (German: Albert Einstein Albert Einstein ) (14 March 189 - 18 April 1955) was a German-born Nobel Prize-winning physicist. He is best known for his discovery of the theory of relativity, and in particular the law of mass-energy equivalence. He was awarded the Nobel Prize in Physics in 1921. He was awarded the prize for his outstanding contribution to theoretical physics , and especially for his research on photoelectricity [1]. Albert Einstein In 1948, Albert Einstein did a lot of research in various fields of physics and contributed a lot to new inventions and discoveries. The most famous special theory of relativity integrated mechanics and electromagnetism, and the general theory of relativity established a new theory of gravitation by applying the theory of relativity to unequal motion.