Eysenck was a leading exponent of behaviourism although he also proposed that genetic factors play a substantial part in determining the psychological differences between people.
Controversially, he was an early supporter of the thesis that there was a unitary intelligence which could be measured by IQ tests, and concluded that because research showed the average measured intelligence of Blacks was significantly lower than that of Whites the difference must therefore be genetic (although his later work gives greater emphasis to environmental factors, and accepts that the differences between ethnic groups might be changed).
He also argued for the importance of genetic factors in explaining criminality. In the 1970s he conducted a series of studies which suggested that the relationship between smoking and cancer was due to personality differences, rather than carcinogens in tobacco, because people who had emotional problems were more likely both to smoke and to succumb to cancer.
This work came under heavy criticism when it emerged that the research had received support from funds provided by American tobacco companies. In The Natural History of Creativity (1995), he argued that creativity stems from the psychopathological characteristics of creative persons and geniuses, rooted in their DNA structures.
a supporter of the Gauquelin's conclusion that planetary positions correlate with the personality of eminent professionals
In general Eysenck's contributions to astrological research were his insistence that there was an effect to be explained, his insistence that matters be resolved by appropriate experiments, and his refusal to be satisfied with dismissive explanations
Despite this strongly scientific interest, Eysenck was not shy, in later work, of giving attention to parapsychology and astrology. Indeed, he believed that empirical evidence supported the existence of paranormal abilities
CHART DATA: According to his birth certificate, he was born at 5:00 AM (4:00 AM GMT) March 4, 1916, at Berlin (Allemagne)