2008 - 2009 National Endowment for the Humanities Fellowship
2006 Guggenheim Fellowship
2004 PRIZES for Khrushchev: The Man and His Era
Pulitzer Prize for biography
National Book Critics Circle award for biography.
Wayne S. Vucinich Prize of the American Association for the Advancement of Slavic Studies for the most important contribution to Russian, Eurasian and East European Studies in any discipline of the humanities or social sciences.
Robert H. Ferrell Book Prize of the Society for Historians of American Foreign Relations for distinguished scholarship in the history of American foreign relations
2004 "Alumnus of the Year" of the Harriman Institute, Columbia University
2000 Fellowship, Woodrow Wilson International Center for Scholars
1992-1993 National Humanities Endowment Fellowship
1988 (spring) Fulbright-Hays Faculty Research Fellow; ACLS/Soviet Academy of Sciences Exchange Program
1987 (fall) Senior Fellow, Harriman Institute, Columbia University
1986-1987 Karl Loewenstein Fellowship, Amherst College
1983-1984 National Council for Soviet and East European Research Contract
1982-1983 Rockefeller Humanities Fellowship; Kennan Institute for Advanced Russian Studies Visiting Grant
1970-1971 Council on Foreign Relations International Affairs Fellowship
1965-1966 Fulbright-Hays Fellowship; US-Soviet Academic Exchange
1964-1965 President's Fellow, Columbia University
1963-1964 Foreign Area Fellowship (also 1964-1965, 1966-1967); Honors Fellowship of Russian Institute (for highest rank in class)
1962-1963 Woodrow Wilson National Fellowship