János Köllõ studied economics at the Budapest (then Karl Marx) University in 1972-77. He has a doctoral degree in sociology (1980) and a "candidate's degree" (Ph.D.) in economics (1990). He is a full-time researcher at the Institute of Economics of the Hungarian Academy of Sciences (1977-92, 1994-). Served as a visiting researcher in Collegium Budapest Institute for Advanced Study (1993-94), and the William Davidson Institute, Ann Arbor (2003).
He has been engaged in the analysis of labor markets, industrial relations and the transformation of Central and East European labor markets in the post-communist period.

He joined IZA as a Research Fellow in October 2000.


IZA Publications

IZA Discussion Paper No. 16645
János Köllő, István Boza, Virág Ilyés, Zsófia Kőműves, Lili Katalin Mark
IZA Discussion Paper No. 8644
János Köllő, Bence Czafit
published as 'Employment and wages before and after incarceration - evidence from Hungary' in: IZA Journal of European Labor Studies. 2015, 4:21
IZA Discussion Paper No. 7632
published in: Economics of Transition, 2015, 23(1), 105-134
IZA Discussion Paper No. 6224
Peter Elek, János Köllő, Balázs Reizer, Péter A. Szabó
published in: Informal Employment in Emerging a Transition Economies, Research in Labor Economics, 34,. Emerald Group Publishing Limited, 2012, 135-166
IZA Discussion Paper No. 5539
published in: Educational Research and Evaluation, 2012, 18 (5), 459-488
IZA Discussion Paper No. 2179
published in: Structural Change and Economic Dynamics, 2008, 19 (3), 203-220.
IZA Discussion Paper No. 1073
published in: Economics of Transition, 2008, 16 (2), 199-221.
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