Robert R. McCrae is a prominent psychologist known for his work in personality psychology. He is best recognized for developing the Five Factor Model of personality, which identifies five key traits: openness, conscientiousness, extraversion, agreeableness, and neuroticism. This model has significantly influenced how psychologists understand human behavior and personality assessment. McCrae has authored numerous research papers and books, contributing to the field's understanding of personality traits across different cultures. His work emphasizes the stability of personality over time and its impact on various life outcomes, including relationships and mental health.