Hannes received his PhD in Work Psychology from ETH Zurich in 2008. Before that, he studied Psychology with focus on Work and Organizational Psychology at University of Freiburg, University of Melbourne, and Dresden University of Technology. His research interests include team effectiveness and voice/silence in organizations. His research has appeared or is forthcoming in Journal of Management, Leadership Quarterly, and Human Resource Management Review, among others. He has participated in about 40 presentations at international conferences and given workshops on multilevel modeling in R. Hannes serves on the editorial boards of Group & Organization Management, Small Group Research, and Journal of Leadership and Organizational Studies.