Harvard University, Davis Center, Center Associate (0,05) 01.12.2017-
Harvard University, Davis Center, külalisteadur 01.09.-30.11.2017
Singapuri Riiklik Ülikool, Lee Kuan Yew School of Public Policy, külalisprofesasor 01.01.-30.06.2017
Zhejiang University, Hangzhou, China, Visiting Professor of Public Administration and Technology Management 01.01.2015–31.12.2015
Universitas Gadjah Mada (Indoneesia), Visiting Professor of Public Policy and Administration 01.01.2015–31.12.2015
Universiti Malaya (Kuala Lumpur), Visiting Professor of Public Administration 01.01.2013–31.12.2013
Central University of Finance and Economics (Peking), Visiting Professor of Public Administration 2013–2014
Université catholique de Louvain, Louvain-la-Neuve, Belgium, Chaire André Molitor (professeur invité) 01.01.2012–31.12.2014
Erfurti Ülikool, Visiting Professor of Governance 01.01.2007–31.12.2007
European Business School (Oestrich-Winkel), Lehrbeauftragter in Economic Foundations of Innovation 01.01.2006–31.12.2014
Universiti Malaya (Kuala Lumpur), Visiting Professor of Public Administration 2013
Universite catholique de Louvain, Louvain-la-Neuve, Belgium, Chaire Andre Molitor (professeur invite) 2012-2014
Erfurti Ülikool, Visiting Professor of Governance 2007
Tartu Ülikool, Sotsiaal- ja haridusteaduskond, Riigiteaduste instituut, Avaliku halduse õppetool, Professor (1.00) 1996-2006
Lundi Ülikool, Visiting Professor of Sociology 1996
Tartu Ülikool, Sotsiaal- ja haridusteaduskond, Riigiteaduste instituut, Avaliku halduse õppetool, Erakorraline professor (1.00) 1995-1996
University of Frankfurt/Main, Germany, Lecturer in Political Science 1994-1995
Advisor to the President of the Republic of Estonia for Administrative Organization 1994
Tartu Ülikool, Sotsiaal- ja haridusteaduskond, Külalisprofessor (1.00) 1993-1995
University of Giessen, Germany, Lecturer in Political Science 1991-1993
Federal German Ministry of Research and Technology, Policy Planning Staff, Declined senior tenured civil service position 1991
German Council on Higher Education and Research Policy, Executive Office (Task Force to Assess and Restructure the New States, Executive Secretary and Administrative Assistant to three Commissions and State Coordinator for the State of Thuringia 1990-1992
U.S. Congress, House of Representatives, House Administration Committee, Subcommittee on Elections, Legislative Analyst to Senior Legislative Analyst (as APSA Congressional Fellow) 1989-1990
University of Marburg, Germany, Lecturer in American Studies 1989
Brethren Colleges Abroad Marburg, Instructor in Political Science and Program Assistant (-1987), 1986-1989