Albert Einstein German-born theoretical physicist Albert Einstein (14 March 1879 - 18 April 1955) is regarded as one of the greatest and most important physicists of all time. Although he has made substantial contributions to the theory of quantum mechanics, Einstei is best known for his work on the theory of relativity. Relativity and quantum mechanics are the two main tenets of modern physics. The relativity theory-derived mass-energy equivalence formula he developed for energy has been labeled "the most famous equation in the world." His writing has had a significant influence on scientific ideas. He won the 1921 Nobel Prize in Physics for his discovery of the law of the photoelectric effect, which was a significant turning point in the evolution of quantum theory. Because of his originality and intellectual prowess, "Einstein" has come to stand for genius. Numerous works of literature, film, theater, and music either center on or draw inspiration from Einstein. Images of forgetful lecturers have been copied and exaggerated about his expressive features and unique hairdo. For his contributions to theoretical physics, particularly his discovery of the law of the photoelectric effect, Einstein received the 1921 Nobel Prize in Physics in 1922. Throughout his life, Einstein received a number of honors and awards. Read More Read Less