Personality is composed of both temperament and character traits. Whereas temperament refers to an individual’s innate emotional predisposition, character is what we intentionally make of ourselves. In this book, the authors present current research in the study of the psychology of personality with a focus on personality developments in neonates; positive psychology and the happy personality; the genetic influences of subjective well-being through mediation by personality traits and evaluative cognitions; job satisfaction and personality traits; the effect of personality on reasoning; temperament and character in first-episode schizophrenia; the relationship between personality and mood frequency; and electrophysiological dysfunction in psychopathic violent women.