Other activities/andere Aktivitäten
| 2024- | Representative of the University of Cologne at the GESIS curatorium | |
| 07/2022- | Chair of the Fritz Thyssen-Preis Jury | |
| 04/2021- | Member of the advisory board of the Nationalen Diskriminierungs- und Rassismusmonitors (NaDiRa) at the Deutsches Zentrum für Integrationns- und Migrationsforschung (DeZIM) | |
| 2021- | Editorial member of the journal Hagira | |
| 03/2021-07/2021 | Scientific advisor for the German Israeli Foundation | |
| 09/2020-09/2022 | Management Committee (MC) member of the EU COST Action CA19103 LGBTI+ Social and Economic (in)equalities | |
| 2019-2022 | Consultantancy for the European Commission in the project “Science of values and identity in the political process” | |
| 04/2019-08/2021 | Researcher at the Minerva Center on Intersectionality in Aging (MCIA) at the University of Haifa, Haifa, Israel | |
| 2019-2021 | Director of the Institute of Sociology and Social Psychology, University of Cologne | |
| 2019 | Chair of the research ethics committee at the Faculty of Economics and Social Sciences, University of Cologne | |
| 2018- | GESIS representative for the University of Cologne | |
| 2018- | Member of the nominations committee for honorary and apl professorships at the Faculty of Economics and Social Sciences, University of Cologne | |
| 2018- | Member of the international advisory board of the International Journal of Japanese Sociology | |
| 2018-2022 | Associate editor of Migration and Society, a specialty section within Frontiers in Sociology | |
| 2018- | Associate editor of Measurement Instruments for the Social Sciences | |
| 2018-2022 | Associate editor in the journal methods, data, analyses (mda) | |
2018-2019 | Guest editor of a special issue on immigration from the migrants' perspective in the journal Social Inclusion | |
| 2017- | Associate editor in the journal Survey Research Methods | |
| 2017-2023 | Editorial member in the journal Social Inclusion | |
2017-2019 | Member of the research ethics committee at the Faculty of Economics and Social Sciences, University of Cologne | |
| 2017-2019 | Guest editor of a special issue on measurement invariance: Testing for it and explaining why it is absent in the journal Survey Research Methods | |
| 2017-2018 | Guest editor of a special issue on Comparative survey analysis: Models, techniques and applications in the journal methods, data, analyses | |
| 2017-2018 | Guest editor of a special issue on Comparative survey analysis: Comparability and equivalence of measures in the journal methods, data, analyses | |
| 9/2017 | Visiting Professor, Sapienza University, Rome | |
| 2016-2018 | Guest editor of a special issue on explaining attitudes toward immigration: findings from the immigration module in the European Social Survey 2014-15 in the Journal of Ethnic and Migration Studies | |
| 2016-2017 | Guest editor of a special issue on immigration and immigrants in European societies in the International Journal of Comparative Sociology | |
| 2016-2017 | Statistical and methodological consulting for the OECD | |
| 2016 | Board member of the evaluation committee of the inter-university Master Program Public Opinion and Survey Research, Switzerland | |
| 2015-2023 | Editorial board member of the journal Social Science Research | |
| 2015-2022 | Editor of the book series of the European Association of Methodology (EAM) | |
| 2015-2018 | Guest editor of a special issue on measurement invariance in cross-national studies in the journal Sociological Methods & Research | |
| 2015-2017 | Member of the advisory board in the journal Survey Research Methods | |
| 2015-2017 | President of the European Survey Research Association (ESRA) | |
| 2014-2021 | Member of the scientific audit of GESIS | |
| 2014- | Advisory board member of the journal Social Problems | |
| 2013- | Co-director of the University Research Priority Program (URPP) “Social Networks” at the University of Zurich | |
| 2013-2016 | Co-director of the Department of Sociology, University of Zurich | |
| 2013-2015 | Vice president of the European Survey Research Association (ESRA) | |
| 2011- | Advisory board member of the journal Politische Psychologie – Journal of Political Psychology | |
| 2011-2013 | Chair of the scientific committee of ESRA | |
| 2009-2012 | Guest editor of a special issue on the theory of human values in the journal Survey Research Methods |