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He was the founder of experimental psychology and established the first psychological lab.
He referred to his branch of psychology as "physiological psychology".

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Especially influential in the field of "functionalism" which was an alternative to structuralism.
He founded the APA in 1892.
The branch of functionalism he is most commonly associated with id "genetic psychology" which concerns the developmental elements of psychological conditions.

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Studied under Wundt.
Established Structuralism at Cornell University in the United States.
Structuralism sought to explain mental phenomena beyond just their description.
One problem with structuralism, however, was that it left very little room for practical implications (social validity).

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Studied animal psychology and reflexology.
Famously coined "conditioned" and "unconditioned" responses and stimuli through his work with dogs.

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His research focused on the process of learning, in both nonhumans and people.
Emphasized the "law of effect" which he believed accounted for S-R classical behaviorism.

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Most associated with the first wave of behaviorism.
Viewed psychology of behaviorism as purely objective experimental natural science, he left no room for introspection or private events (1913).
First to use the terms behaviorism and behaviorist.

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Proposed "operationalism" (1927) which is where the meaning of the scientific concept is synonymous with the corresponding set of operations.
This viewpoint became especially prominent in the 1930's.

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Creator of the Woolworth personality test.
Proposed an S-O-R formulation of behavior. "O" being organic states such as motives, emotions, etc.

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Neobehaviorist and learning theorist in the 1940's
Introduced organismic variables such as expectancies and cognitive maps, which placed behavior among the language and study of cognition.
Influential member of the neobehaviorist movement which diverted study away from the explanations of Woodworth.

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Father of radical behaviorism.
Differentiated between "public" and "private" events and included both in his explanation of behavior.
Wrote Verbal Behavior (1957)