From 1990 to 2001 he worked at the Institute for Social Research in
Frankfurt. 1992 at the Faculty of Social Sciences at Goethe University.
Habilitation in Political Science and Political Sociology. 2007 awarded
the title of Associate Professor at Goethe University.
substitute and visiting professorships as well as lectureships in
Germany and abroad. From 2007-2012 visiting professor of political
science with a focus on political theory at TU Berlin; in winter
semester 2012/13 visiting professor of critical social research at JLU
Gießen; summer semester 2013 and winter semester 2013/14 visiting
professor of critical social theory at Department of Social Sciences at
Goethe University Frankfurt. From April 2014 to November 2017 as Senior
Fellow at the Rosa Luxemburg Foundation, Berlin.
Lecturer of the
Rosa Luxemburg Foundation and the Hans Böckler Foundation, member of the
Advisory Board of the Federation of Democratic Scientists and the
Scientific Advisory Board of Attac Germany, Chairman of the Scientific
Advisory Board of the Rosa Luxemburg Foundation, member of the editorial
board of the journal LuXemburg, member of the Scientific Advisory Board
of the journal Das Argument, member of the Editorial Advisory Board of
the British journal Historical Materialism as well as co-editor of the
Turkish journal Felsefelogos.