- Max Planck Institute for Human Development (Berlin), postdoctoral researcher in the Centre for Adaptive Behavior and Cognition
- Max Planck Project Group. Common Goods: Laws, Politics and Economics (Bonn), postdoctoral researcher in the rationality group (until February 2001)
- ESRC Centre for Economic Learning and Social Evolution (University College London), senior research fellow.
- National Institute of Neurological Disorders and Stroke (part of the NIH), visiting fellow in the Cognitive Neuroscience Section.