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.
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.
Widely regarded as the father of analytical psychology, Carl Jung is one of the most important contributors to symbolization and dream analysis. The concepts of socionics and a popular psychometric instrument called Myers-Briggs Type Indicator (MBTI) were developed from Jung's theory. Apart from working as a psychiatrist and psychoanalyst, Carl Jung was also an artist, craftsman, builder, and prolific writer.
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.”
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.
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.
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.
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.
11 Ivan Pavlov
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.
Daniel Kahneman is an Israeli economist and psychologist. He was honored with the 2002 Nobel Memorial Prize in Economic Sciences for his work on behavioral economics. In 2011, Kahneman was named among the top global thinkers by Foreign Policy magazine. In 2015, Daniel Kahneman was ranked seventh in the most influential economist in the world list published by The Economist.
Psychologist and Stanford professor Philip Zimbardo is best known for his Stanford prison experiment, which proved how prisoners get abusive due to situational factors. He is also known for his books The Lucifer Effect and The Time Paradox and has received a Lifetime Achievement Award from the American Psychological Foundation.
16 Eugene Landy
17 Erik Erikson
Erik Erikson was a German-American psychoanalyst and developmental psychologist best remembered for developing a theory on the psychological development of humans. He is credited with coining the term identity crisis, the failure to achieve ego identity. Also a prolific writer, Erikson won a US National Book Award and a Pulitzer Prize for his book Gandhi's Truth.
18 Lev Vygotsky
Lev Vygotsky was a Soviet psychologist best remembered for his groundbreaking work on developmental psychology in children. He is also remembered for his work on the relationship between thought and language, which remains influential to this day. A man with various interests, Vygotsky's work covered topics like the philosophy of science and the psychology of art.
19 Carl Rogers
Albert Bandura is a Canadian-American psychologist who has made significant contributions to several fields of psychology, such as personality psychology, therapy, and social cognitive theory. Regarded as the greatest living psychologist, Bandura is also counted among the most influential psychologists ever. He has been honored with over 16 honorary degrees. In 2016, Albert Bandura received the National Medal of Science.
23 Henry Murray
24 Alfred Adler
Alfred Adler was an Austrian psychotherapist and medical doctor. He is credited with founding the school of individual psychology. He was also one of the founders of the psychoanalytic movement along with Sigmund Freud and Freud's colleagues. In 2002, a survey conducted by Review of General Psychology named Adler among the 20th century's most eminent psychologists.
One of the most prominent intellectuals of the 20th century, Theodor Adorno was a pioneer of the Frankfurt School of Critical Theory and despised the culture industry. Born to a singer mother, the German sociologist grew up amid music and could even play Beethoven on the piano by 12.
27 John Money
28 Erich Fromm
Erich Fromm was a German social psychologist, psychoanalyst, sociologist, and socialist. A German Jew, he fled the Nazi regime and settled in the United States. He was a co-founder of The William Alanson White Institute and was associated with the Frankfurt School of critical theory. He is best remembered for authoring the book Escape from Freedom.
33 Harry Harlow
34 Dan Ariely
Dan Ariely is an Israeli-American professor and author. He is the founder of the research institution, The Center for Advanced Hindsight, and the co-founder of several companies. Currently, he is also the James B. Duke Professor of psychology and behavioral economics at Duke University. He is the author of the three New York Times bestsellers as well.
37 Ian Lithgow
38 Paul Ekman
Born in Prussia, Magnus Hirschfeld had initially studied languages and had then earned a medical degree. He grew up to be a prominent sexologist and gay rights activist who referred to the LGBT community as the “third sex.” His one-of-a-kind sexology institute was later destroyed by the Nazis.
42 Kurt Lewin
47 Amos Tversky
Amos Tversky was an Israeli cognitive and mathematical psychologist. He is known for his contribution to the discovery of systematic human cognitive bias. The son of a social worker and politician, he received his doctorate from the University of Michigan before embarking on an academic career. He worked closely with his longtime collaborator, Daniel Kahneman, and wrote several papers together.