Hans Jürgen Eysenck, PhD, DSc (; 4 March 1916 – 4 September 1997) was a psychologist born in Germany, who spent his professional career in Great Britain. He is best remembered for his work on intelligence and personality, although he worked in a wide range of areas within psychology. At the time of his death, Eysenck was the living psychologist most frequently cited in the peer-reviewed scientific journal literature.