Hanna Szekeres, Graduate Student

My general research interests are different aspects of intergroup relations, particularly involving groups in conflict (e.g., the Israeli-Palestinian conflict), minority and majority members in a society (e.g., the Roma and non-Roma in Eastern Europe, African Americans or Muslims and Whites in the U.S.), or gender norms. In my dissertation research, I investigate the psychological and intergroup processes that underlie the phenomenon of witnessing and (not) confronting prejudice and discrimination as a bystander.




Saguy, T., Szekeres, H., Nouri, R., Goldenberg, A., Doron, G., Dovidio, J. F., & Halperin, E. (2015). Awareness of Intergroup Help Can Rehumanize the Outgroup. Social Psychology and Personality Science, 6(5), 551-558.


Saguy, T., & Szekeres, H. (2018). Changing Minds via Collective Action: Exposure to the 2017 Women's March Predicts Over-time Decrease in (Some) Men's Gender System Justification. Group Processes and Intergroup Relations, 21(5), 678-689.

Siwar Aslih, Graduate Student

I am currently a Ph.D student at the University of Groningen and the IDC Herzliya, supervised by Martijn van Zomeren, Eran Halperin and Tamar Saguy. I received my dual-major B.A. in Psychology and Educational counseling and my M.A. in group counseling from University of Haifa. My main areas of interest are collective action, power relations embedded in intergroup conflicts, and collective emotions and beliefs. My PhD project investigates emotions and emotion regulation in collective action in the context of intractable conflicts with a power relations perspective.

Aharon Levy, Post-doctoral fellow

Aharon Levy is a Research and Teaching Fellow at the Columbia Business School Management division. Aharon's research examines psychology as a means for the promotion of social change. Specifically, Aharon studies the potential of Gateway Groups to improve intergroup relations, and the development of psychological interventions for intergroup conflict resolution. Additionally, Aharon also studies the role information plays in distributive negotiations. Apart from his research, Aharon also teaches courses on psychology & social change, and consults organizations in the field of intergroup relations.



  • Levy, A., Halperin, E., Van Zomeren, M., & Saguy, T. (in press) Inter racial gateways: The potential of biracials to reduce threat and prejudice in inter racial dynamics. Race and Social Problems.

  • Levy, A. & Maaravi, Y. (2018) The boomerang effect of psychological interventions. Social influence, 13(1), 39-51.

  • Levy, A., Saguy, T., Van Zomeren, M., & Halperin, E. (2017) Ingroups, outgroups, and the gateway groups between: The potential of dual identities to improve intergroup relations. Journal of Experimental Social Psychology, 70, 260-271. 

  • Levy, A., Saguy, T., Halperin, E., & Van Zomeren, M. (2017) Bridges or barriers? Conceptualization of the role of multiple identity gateway groups in intergroup relations. Frontiers in Psychology. 8,  1097-1117.

  • Levy, A., van Zomeren, M., Saguy, T., & Halperin, E. (2017). Intergroup emotions and gateway groups: Introducing multiple social identities into the study of emotions in conflict. Social and Personality Psychology Compass, 11(6), 1-15.

  • Maaravi, Y.  & Levy, A. (2017) When your anchor sinks your boat: Information asymmetry in distributive negotiations and the disadvantage of making the first offer. Judgment and Decision Making, 12(5), 420-429.

  • Halperin, E. & Levy, A. (2017). Intractable Conflicts. In F. M. Moghaddam (Ed). The Sage Encyclopedia of Political Behavior, pp. 406-408, Sage.    

Eric Shuman, Phd Student

I am a PhD student in social psychology at the University of Groningen supervised by Tamar Saguy, Eran Halperin, and Martijn van Zomeren. I received a B.S. in Psychology and a B.A. in Global Politics from Washington and Lee University in 2014, and completed my M.A. in Social Psychology at the IDC Herzliya. My research interests include collective action and emotions, and power relations in conflict. In particular, I am interested in different types of collective action (e.g. nonviolent, nonnormative, violent). My research examines psychological factors that promote support for these types of action, but also the effects and effectiveness of these types of action at motivating the high power group to address inequality and pursue conflict resolution. [personal page]


Selected Publications

Shuman, E., Johnson, D., Saguy, T., & Halperin, E. (2018). Threat to the group’s image can motivate high identifiers to take action against in-group transgressions. Personality and Social Psychology Bulletin, 44, 1523-1544.


Shuman, E., Halperin, E., & Reifen Tagar, M. (2018). Anger as a Catalyst for Change? Incremental Beliefs and Anger’s Constructive Effects in Conflict. Group Processes and Intergroup Relations, 21, 1092 - 1106.

Shuman, E., Cohen-Chen, S., Hirsch-Hoefler, S., & Halperin, E. (2016). Explaining normative versus non-normative action: The role of implicit theories. Political Psychology, 37, 835-852.

Danit Sobol, Phd student

I am currently a Ph.D student. My main area of interest is inequality perceptions among disadvantaged groups. In my thesis project, I examined the association between optimal contact within romantic relationships and women's perceptions regarding gender inequality. My Ph.D project focuses on identity disappointment- what happens once a sense of shared identity is being failed. 

Selected Publications:

Saguy, T., Shchory-Eyal, N., Hasan-Aslih, S., Sobol, D., & Dovidio, J. F. (2017). The irony of harmony: Past and new developments. Intergroup contact theory: Recent developments and future directions, 53-71.


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