René Mõttus is a leading personality psychologist based at the University of Edinburgh (and affiliated with the University of Tartu), specializing in fine-grained descriptions of personality, its development across the lifespan, and its links to health, aging, cognition, and behavior. He explores how subtle “nuance-level” traits—rather than broad trait categories—can better predict real-world outcomes, such as longevity or wellbeing. He also teaches and supervises research in personality and intelligence, works with the large-scale Estonian Biobank data, and contributes widely to scholarship and public discourse on how personality matters in everyday life.