Henrik Olsson is a cognitive scientist studying decision making, judgment under uncertainty, social cognition, categorization, and visual perception. A recurrent theme in his research is the development of new psychological theories and the use of formal mathematical models to try to understand the underlying psychological processes. Another theme is the ecological perspective. To understand adaptive behavior, we must consider how the environment, social or physical, is structured and how psychological processes exploit, or fail to exploit, these structures. Henrik’s current work focuses on understanding how properties of individual decision strategies and social network structures affect group performance by connecting research in social cognition and decision making with insights from statistics and machine learning.