## Einstein, Albert (1879–1955)Einstein was a major player in the two fields that revolution zed physics in the first part of the 20th century: relativity theory and quantum mechanics. In his annus mirabilis of 1905, he published four papers on topics of immense significance: the photoelectric effect, the special theory of relativity, the nature of Brownian motion, and the equivalence of matter and energy (including his famous mass-energy relationship, E = mc^{2}). A decade later, he extended the principle
of relativity to included nonuniform (accelerated) motion in his general
theory of relativity, thereby creating a new theory of gravity. Einstein also made important contributions to cosmology, classical problems of statistical mechanics and their application to quantum theory, the theory of atomic transition probabilities, the quantum theory of a monatomic gas, thermal properties of light with low radiation density (which laid the foundation for the photon theory), a theory of radiation including stimulated emission, and the conception of a unified field theory. ## Related category• PHYSICISTS | ||||||

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