David Deutsch is a British physicist and a pioneer in the field of quantum computing. He is best known for his work on the theory of quantum computation, which explores how quantum mechanics can be used to perform calculations more efficiently than classical computers. Deutsch's influential book, The Fabric of Reality, presents his ideas on the nature of reality and the role of scientific theories. In addition to his contributions to quantum computing, Deutsch is also a proponent of the Many-Worlds Interpretation of quantum mechanics. This interpretation suggests that all possible outcomes of quantum measurements actually occur in separate, branching universes. His work has significantly impacted both theoretical physics and the philosophy of science.