Regarded as the father of psychoanalysis, Sigmund Freud was a neurologist. Despite suffering criticism, psychoanalysis remains influential in the fields of psychology and psychiatry; such is the influence Freud has on humanities. Scholars believe that Freud is one of the most influential personalities of the 20th century and that his impact is comparable to that of Marxism and Darwinism.
B. F. Skinner was an American behaviorist, psychologist, inventor, author, and social philosopher. Skinner, who taught psychology at Harvard University, is credited with founding a school of thought in psychology called the experimental analysis of behavior. Regarded as a pioneer of modern behaviorism, Skinner was named the 20th century's most influential psychologist, according to a survey conducted in June 2002.
Canadian clinical psychologist, Jordan Peterson, became internationally known in the 2010s for his views on cultural and political issues. He became active on YouTube in 2016 and shared many videos that have since received millions of views. He has faced criticism for his sexist and misogynistic views. Despite the controversies, he continues to be popular and is a bestselling author.
William James was an American psychologist and philosopher. Widely regarded as the father of American psychology and one of the most influential American philosophers, James was the first educator in the United States to offer a course in psychology. He is also credited with co-founding a psychological school of thought called functional psychology and establishing a philosophical school called pragmatism.
Abraham Maslow was an American psychologist best remembered for creating an idea in psychology called Maslow's hierarchy of needs. Maslow, who advocated self-actualization, is also credited with co-founding the school of transpersonal psychology. In 1967, he was adjudged Humanist of the Year by the popular non-profit organization, American Humanist Association.
10 Carl Rogers
Psychologist and former Harvard professor Timothy Leary was an advocate of psychedelic drugs. His research experiments included the controversial Concord Prison Experiment and Marsh Chapel Experiment. After being fired from Harvard for his actions, he continued promoting his theories through catchphrases such as “turn on, tune in, drop out.”
14 Alfred Adler
15 John Dewey
A staunch advocate of progressive education and liberalism, the American philosopher and psychologist was the founder of the University of Chicago Laboratory Schools. John Dewey’s famous writings included The Reflex Arc Concept in Psychology and Human Nature and Conduct. According to him, passion for knowledge and intellectual curiosity were central to a teacher. He called himself a democratic socialist.
17 Erich Fromm
19 Harry Harlow
Steven Pinker is a Canadian-American linguist, cognitive psychologist, and popular science author. He is also a supporter of the computational theory of mind and evolutionary psychology. His works have earned him awards from organizations like the National Academy of Sciences, the American Psychological Association, and the American Humanist Association. In 2013, he was named in Prospect magazine's World Thinkers list.