Hugh Everett III was an American physicist and mathematician best known for his work in quantum mechanics, particularly for formulating the "many-worlds interpretation" of quantum mechanics in 1957. This interpretation suggests that all possible outcomes of quantum measurements are realized in separate, branching universes, effectively positing the existence of an infinite number of parallel realities.
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A physicist who proposed a unitary relative-state account of quantum measurement, developed in the many-worlds interpretation.
Hugh Everett III in 1964; Hugh Everett III papers, University of California, Irvine; photographer unrecorded in the Wikimedia file record; non-free historical portrait hosted by English Wikipedia
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