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.
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.
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.
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.
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.
Psychologist Carl Rogers was the first to introduce a client-centric approach to psychotherapy and addressed the patient as the client. Besides working on troubled children, he also taught at various institutes, such as the University of Chicago. On Becoming a Person remains one of his best-known books.
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.
John B. Watson was the first to introduce the theory of behaviorism to psychology. He believed human behavior, like animal behavior, should be studied under objective and experimental conditions. One of his experiments included conditioning the fear of white rats into an 11-year-old boy he named Little Albert.
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.
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.
12 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.
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.
Social psychologist Stanley Milgram was inspired by the suffering of the Jews during the Holocaust to understand what drove people to harm others, and thus created his Milgram experiment. He also taught at prestigious institutes such as Harvard and Yale. His studies also included the six degrees of separation concept.
15 Anna Freud
Anna Freud was a British psychoanalyst. The daughter of Sigmund Freud, Anna followed in the footsteps of her father and made important contributions to the field of psychoanalysis. Alongside Melanie Klein and Hermine Hug-Hellmuth, Anna Freud is counted among the founders of psychoanalytic child psychology. Her work and contributions were featured in a documentary titled The Century of the Self.
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.
17 Karen Horney
Remembered for her pioneering work on feminist psychology, Karen Horney studied medicine at a time when women weren’t allowed in universities. Going against Sigmund Freud’s concept of penis envy, she suggested the idea of womb envy. She believed psychological differences weren’t rooted in gender but rather depended on the socio-cultural influences.
18 Kurt Lewin
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.”
21 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.
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.
24 Albert Ellis
25 John Bowlby
Wilhelm Reich was an Austrian psychoanalyst and doctor of medicine. He is credited with shaping innovations like body psychotherapy, primal therapy, and Gestalt therapy. Also a writer, Reich's books like The Sexual Revolution and The Mass Psychology of Fascism influenced generations of intellectuals. Also a controversial figure, some of Wilhelm Reich's practices caused a disturbance in the psychoanalytic community.
28 Paul Ekman
N. K. Jemisin became the first writer to win the Hugo Best Novel award thrice consecutively and is best known for her Inheritance trilogy and her Broken Earth series. The African-American author is also a trained psychologist and has worked as a counsellor in several universities.
32 Eugene Landy
34 Harry Harlow
Psychologist Harry Harlow proved that monkeys raised without their mothers exhibited abnormal psychological development. He had a long association with the University of Wisconsin–Madison, where he conducted most of his experiments. He was criticized for using dramatic names, such as “pit of despair,” for his experimental devices.
37 France Nuyen
38 James Dobson
The founder of the Focus on the Family, Dr. James Dobson is a qualified psychologist and has also had long stints with a children’s hospital and as a professor of pediatrics. Known for his popular radio program Family Talk, he has penned countless books, such as the bestseller Bringing Up Girls.
American-Canadian developmental psychologist Mary Ainsworth is best remembered for her contributions in developing the attachment theory. She devised the Strange situation procedure during the 1970s to observe early emotional connect and relationship between a caregiver and child. She was ranked as the 97th most cited psychologist of the 20th century in a 2002 survey of Review of General Psychology.
43 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.
Renowned psychologist Carol S. Dweck has taught at both Columbia and Harvard and is now a professor at Stanford. She is best known for her research on fixed mindset and growth mindset and has also penned popular books such as Self-theories: Their Role in Motivation, Personality and Development.