High Quality Content by WIKIPEDIA articles! Raymond Bernard Cattell (20 March 1905 – 2 February 1998) was a British and American psychologist, known for his exploration of many areas in psychology. These areas included: the basic dimensions of personality and temperament, a range of cognitive abilities, the dynamic dimensions of motivation and emotion, the clinical dimensions of personality, patterns of group and social behavior, applications of personality research to psychotherapy and learning theory, predictors of creativity and achievement, and many scientific research methods for exploring and measuring these areas. Cattell was famously productive throughout his 92 years, authoring and co-authoring over 50 books and 500 articles, and over 30 standardized tests. According to a widely cited ranking, he was the 16th most influential and eminent psychologist of the 20th century.