From 1966 to 1968, Harsanyi was part of a team of game theorists tasked with advising the United States Arms Control and Disarmament Agency in collaboration with Mathematica, a consulting group from Princeton University led by Harold Kuhn and Oskar Morgenstern.
Fra 1966 til 1968 var Harsanyi del af en gruppe spilteoretikere, der havde til opgave at rådgive the United States Arms Control and Disarmament Agency i samarbejde med Mathematica, en konsulentgruppe fra Princeton University anført af Harold Kuhn og Oskar Morgenstern.