Wilhelm Wundt Wilhelm Wundt conducted the official start of psychology by founding the first psychology laboratory at the University of Leipzig in 1879 and conducting the first experiments of human behavior.
William James William James is known for the James-Lange theory of emotion, which says that all emotions is the mind's reaction to the stimulus in the environment.
Edward Thordike Edward Thordike's work was centered around the development of educational psychology (the study of how people learn) and is often called the "father of educational psychology."
Sigmund Freud Sigmund Freud specialized in the care and treatment of "nervous disorders," referred to his work as "psychoanalysis," and published many books and papers on his work.
B.F Skinner B.F Skinner is best known for his study on operant conditioning (a type of behavior modification that assists in explaining and altering behaviors and called his new form of behaviorism "radical behaviorism."
Mary Calkins Mary Calkins is best known for her research and writings on self-psychology, she also published four books and over a hundred papers on psychology and philosophy despite her theories not always being accepted.
Alfred Binet Alfred Binet is responsible for the creation of the IQ test (test designed to measure overall intelligence in the form of a score) and a scale called the Binet-Simon scale (helped in understanding the best way to educate all children regardless of their talents).
Ivan Pavlov Ivan Pavlov developed the theory of classical conditioning and the theory called the Pavlonian response by experimenting with dogs and their anticipatory salivation.
Harry Harlow Harry Harlow is best known for his "monkey studies," where he studied the behavior of monkeys in a lab at the University of Wisconsin-Madison, and his research showed that baby monkeys need more sustenance to thrive.
Charles Darwin Charles Darwin is best known for his contributions to the science of evolution and his belief that all species of life have descended from common ancestors.
G. Stanley Hall G. Stanley Hall's studies centered around childhood development and evolutionary theory and was the first president of the American Psychology Association and Clark University.
Jean Piaget Jean Piaget is known for his work on child development and created a theory of cognitive development and epistemological view known as "genetic epistemology."
Carl Rogers Carl Rogers was elected president of the American Psychological Association and wrote 19 books and numerous articles about his humanistic theory.