Visiting Fellow, Department of Statistics, Australian National University, Australia, 1/1990-3/1990; Visiting Fellow, International School of Economic Research, University of Siena, Italy, 7/1993; Visiting Professor, Institute for Market and Plan, W.-J. Goethe Universitaet, Frankfurt a/M, Germany, 4/1994-6/1994, 11/2000-12/2000;Visiting Fellow, Clare Hall, Cambridge, UK, 7/1994-3/1995, Visiting Professor, ETH Zurich, 2/2010, 8/2011(Chair of Sociology in particular, simulation and modeling), 2/2012(Chair of system Design);

Goethe University Frankfurt 12/2000, 2/2009; Max Planck Institute of Economics Jena 12/2000, 10/2006, 3/2007, 9/2011; Russian Academy of Science Pushino 9/2003; University of Stuttgart 6/2005; Leibnitz Gemeinschaft Bonn 10/2006; Universita` Politecnica delle March Ancona 3/2007; Sant'Anna School of Advanced Studies Pisa 9/2008; Frankfurt School of Finance and Management 2/2010; Deutsche Akademie der Technikwissenschaften (Muenchen), 11/2011; ETH Zurich 2/2010, 8/2011; Beijing Normal University, Tianjin University(China), 11/2011, and so on