Bertrand Beauvois is a French psychologist known for his work in social psychology, particularly in the areas of group dynamics and social influence. He has contributed to understanding how individuals behave in group settings and the factors that affect decision-making processes. Beauvois is also recognized for his research on the Bystander Effect, which explores how the presence of others can impact an individual's likelihood to help someone in need. His studies have provided valuable insights into human behavior and the complexities of social interactions.