Freeman John Dyson FRS ( born 15 December 1923 ) is an English-born American theoretical physicist and mathematician , known for his work in quantum electrodynamics , solid-state physics , astronomy and nuclear engineering .
Freeman John Dyson FRS ( born December 15 , 1923 ) is an English-born-American theoretical physicist and mathematician . He is known for his work in quantum electrodynamics , solid-state physics , astronomy and nuclear engineering .