Freeman John Dyson (born 15 December 1923) is a British-American theoretical physicist and mathematician. He is known for his work in quantum electrodynamics, solid-state physics, astronomy and nuclear engineering. He theorized several concepts that bear his name, such as Dyson's transform, Dyson tree, Dyson series, and Dyson sphere.
He is professor emeritus in the Institute for Advanced Study in Princeton, a Visitor of Ralston College, and a member of the Board of Sponsors of the Bulletin of the Atomic Scientists.
