He worked as a political analyst with emphasis on foreign policy, security and defense, transatlantic perspectives in Europe.

He worked with the American Institute for Contemporary German Studies (AICGS) at Johns Hopkins University[1] as well as Bosch Public Policy Fellow at the Transatlantic Academy in Washington, D.C.,[2] and "Non-Resident Fellow" at the Institute for Security Politics at the University of Kiel (ISPK).

[3] He studied at the Freie Universität Berlin and received his PhD from Columbia University in 1972.

He served as an expert for Soviet studies in various British, German, Canadian, and American institutes like the RAND Corporation in Santa Monica.

After 1989, he taught at The Fletcher School of Law and Diplomacy, run by Harvard and Tufts University, and in Warsaw's College of Europe.