戦略国際問題研究所
1981–1983 he has been consultant on Polish affairs for BBC Television, London, England,; 1984–1985 he became Senior Research Analyst at Radio Free Europe (RFE/RL) in Munich, Germany. In 1986 he joined the Center for Strategic and International Studies (CSIS) in Washington, D.C., and established the center's East European department. He became associate director 1986–93 and director in 1993 for East European Studies at Center for Strategic and International Studies, Washington (DC).