Paul Busch was a German-born mathematical physicist, known for his work in quantum mechanics. He made pioneering contributions to quantum measurement theory, being an advocate of the use of POVMs, and to the uncertainty principle in quantum mechanics, where he developed a mathematical formulation of a measurement-disturbance relation.
He was a professor of mathematics at the University of Hull and the University of York. He published over 100 scientific articles and co-authored three books: The Quantum Theory of Measurement, Operational Quantum Physics and Quantum Measurement.