- 1913 – Albert Ellis, American psychologist and author (d. 2007).
- 2004 – John E. Mack, American psychiatrist and author (b. 1929).
Albert Ellis (27 September 1913 to 24 July 2007) was an American psychologist and psychotherapist who founded Rational Emotive Behaviour Therapy (REBT). He held MA and PhD degrees in clinical psychology from Columbia University, and was certified by the American Board of Professional Psychology (ABPP). He also founded, and was the President of, the New York City-based Albert Ellis Institute. He is generally considered to be one of the originators of the cognitive revolutionary paradigm shift in psychotherapy and an early proponent and developer of cognitive-behavioural therapies.
Based on a 1982 professional survey of US and Canadian psychologists, he was considered the second most influential psychotherapist in history (Carl Rogers ranked first in the survey; Sigmund Freud was ranked third). Psychology Today noted that, “No individual—not even Freud himself—has had a greater impact on modern psychotherapy.”
John E. Mack
John Edward Mack (04 October 1929 to 27 September 2004) was an American psychiatrist, writer, and professor and the head of the department of psychiatry at Harvard Medical School. In 1977, Mack won the Pulitzer Prize for his book A Prince of Our Disorder on T.E. Lawrence.
As the head of psychiatry at Harvard Medical School, Mack’s clinical expertise was in child psychology, adolescent psychology, and the psychology of religion. He was also known as a leading researcher on the psychology of teenage suicide and drug addiction, and he later became a researcher in the psychology of alien abduction experiences.