Freeman Dyson is now retired, having been for most of his life a professor of physics at the Institute for Advanced Study in Princeton. His most useful contribution to science was the unification of the three versions of quantum electrodynamics invented by Feynman, Schwinger and Tomonaga. He has written a number of books about science for the general public. Dyson is a fellow of the American Physical Society, a member of the US National Academy of Sciences, and a fellow of the Royal Society of London. In 2000 he was awarded the Templeton Prize for progress in Religion.