Albert Ellis (September 27, 1913 – July 24, 2007) was an American psychologist who in 1955 developed Rational Emotive Behavior Therapy (REBT). He held M.A. and Ph.D. degrees in clinical psychology from Columbia University and American Board of Professional Psychology (ABPP). He also founded and was the president emeritus 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 the founder of cognitive-behavioral therapies. Based on a 1982 professional survey of USA and Canadian psychologists, he was considered as the second most influential psychotherapist in history (Carl Rogers ranked first in the survey; Sigmund Freud was ranked third). Prior to his death, Psychology Today described him as the “greatest living psychologist.”
Ellis was born to a Jewish family in Pittsburgh, Pennsylvania, USA, in 1913. He was the eldest of three children. Ellis' father was a businessman, often away from home on business trips, who reportedly showed only a modicum of affection to his children.