Robbert Dijkgraaf, IAS Director and Leon Levy Professor, remembers Freeman J. Dyson, the legendary physicist, writer, and fearless intellectual explorer who served on the Faculty in the School of Natural Sciences at the Institute for over 65 years. “As an eternal graduate student, a ‘rebel’ in his own words, Dyson was unafraid to question everything and everybody," writes Dijkgraaf in the PNAS. “… Perhaps he understood better than most that progress stems from disagreement more than agreement.”