Hans Jurgen Eysenck Carl Sargent

Hans Jürgen Eysenck was a prominent German-born British psychologist recognized for his extensive research on intelligence and personality. At the time of his passing, he was among the most frequently cited living psychologists in academic literature. Eysenck's work delved into areas such as the link between personality types and health risks, and the relationship between IQ scores and race, which generated considerable debate. Despite his prolific output, including numerous books and articles, his research has been subject to scholarly scrutiny, with identified errors and suspicions of data manipulation. Several of his co-authored papers were deemed incompatible with modern clinical science, leading to multiple retractions and statements of concern from scientific journals.

Born in Berlin, Hans Eysenck's early life was marked by his family's involvement in the arts and his upbringing by his maternal grandmother. His opposition to the Nazi regime prompted his emigration to England in the 1930s, a move that became permanent due to his anti-Nazi stance. His German citizenship initially posed challenges for employment and nearly led to internment during the war. Eysenck earned his PhD from University College London, where he worked under Professor Sir Cyril Burt, a relationship that proved to be complex. He later became a Professor of Psychology at the Institute of Psychiatry, King's College London, holding the position from 1955 to 1983.

Eysenck made substantial contributions to the scientific understanding of personality, developing a distinctive dimensional model. This model was grounded in empirical factor-analytic research and sought to connect personality traits to biological variations. He also played a role in developing treatments for mental illnesses. Eysenck was the founder and editor of the international journal Personality and Individual Differences. His prolific academic career included authoring around 80 books and over 1,600 journal articles. He had children from two marriages, including a son, Michael Eysenck, who also became a psychology professor. His second wife, Sybil B. G. Eysenck, was also a psychologist with whom he collaborated extensively.

Throughout his career, Eysenck's research frequently ignited controversy. His publications explored topics such as the efficacy of psychotherapy, critiques of psychoanalysis, political behavior, and the relationship between race, intelligence, and education. His work on IQ scores and race, in particular, was highly contentious, with claims about genetic influences that faced strong opposition and accusations of scientific racism, partly due to later funding from the Pioneer Fund. Furthermore, studies linking personality types to diseases like cancer, and research supported by the tobacco industry, also came under significant scrutiny. Scholars have pointed to methodological flaws, data issues, and a lack of replicability in some of his findings, leading to numerous retractions and expressions of concern from academic journals.

“My hatred of Hitler and the Nazis, and all they stood for, was so overwhelming that no argument could counter it.”

“I always felt that a scientist owes the world only one thing, and that is the truth as he sees it. If the truth contradicts deeply held beliefs, that is too bad. Tact and diplomacy are fine in international relations, in politics, perhaps even in business; in science only one thing matters, and that is the facts.”

“I have no doubt, smoking is not a healthy habit.”