Special and general theories of relativity of German-born American theoretical physicist Albert Einstein revolutionized modern thought on the nature of space and time and formed a base for the exploitation of atomic energy; he won a Nobel Prize of 1921 for his explanation of the photoelectric effect.

His paper of 1905 formed the basis of electronics. His first paper, also published in 1905, changed the world.
He completed his Philosophiae Doctor at the University of Zurich before 1909.

Einstein, a pacifist during World War I, stayed a firm proponent of social justice and responsibility.

Einstein thought that Newtonion mechanics no longer enough reconciled the laws of classical mechanics with those of the electromagnetic field. This thought