== Akademisk karriere ==
* Ansat i ''Center for Naval Analyses'' (1978-82).
* Forskningsmedarbejder ved ''Harvard University, Center for Science and International Affairs (1981-84).
* Ass. professor ved Princeton University, Woodrow Wilson School (1984-89).
* World Politics, Board of Editors (1985-89).
* Carnegie Endowment for International Peace, resident associate (1986-87).
* Gæste-lærer ved The Brookings Institution(1988 -)
* Ass. professor ved University of Chicago (1989-95).
* Medlem af bestyrelsen for ''Bulletin of the Atomic Scientists'' (1992-01). 
* Professor ved ''University of Chicago'' (1995-99).
* University of Chicago, deputy dean of social sciences (1996-99).
* Belfer Professor of International Affairs, John F. Kennedy School of Government, Harvard University (1999-)
* Academic Dean, John F. Kennedy School of Government, Harvard University (2002-06).
Levende_personer Filosofi