Freeman John Dyson is a British-born American theoretical physicist and mathematician, famous for his work in quantum electrodynamics, solid-state physics, astronomy and nuclear engineering.

Dyson is a member of the Board of Sponsors of the Bulletin of the Atomic Scientists. Dyson has lived in Princeton, New Jersey, for over fifty years. As of 2013 Dyson is on the Board of Trustees of the Space Studies Institute. Dyson is a long-time member of the JASON defense advisory group.

1998, Dyson joined the board of the Solar Electric Light Fund. As of 2003, Dyson is the president of the space research organization founded by Gerard K. O'Neill. Dyson is a regular contributor to the New York Review of Books.