Political Scientist · Research Fellow at the University of Vienna
Koichi Osamura
I study coalition politics, legislative behavior, and party competition, focusing on presidential systems in Latin America and parliamentary democracies in Western Europe.
I am a research fellow at the Department of Government, University of Vienna, where I obtained my doctorate in Political Science. Besides my substantive work, I enjoy learning new methods and techniques, especially new visualization tools.
Research
What I work on
Coalition politics
How presidents build and keep legislative support in multiparty systems, and what motivates parties and legislators to join and support a coalition.
Legislative behavior
Party cohesion, deviation, and roll-call voting, with a focus on South American legislatures.
Portfolio design
How governments create, merge, and reallocate ministerial portfolios in European democracies.
Methods
Analysis of electoral outcomes, expert surveys, bureaucratic appointments; Text analysis.
Latest
Recent work
Party Politics · 2026 · OnlineFirst
Defended my doctoral dissertation, Seeking Office, Policy, or Votes? An Analysis of Legislative Coalitions, Motivations, and Behavior in Multiparty Presidential Systems, at the University of Vienna
2 photos
Presented Tailoring ministerial office to office holders at the EPSS 2026 Annual Conference
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