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- Nick Petrovic, founder of the Mind Profile Clinic
- Allan Paivio
- Linda Papadopoulos
- Gordon Parker
- Ivan Pavlov
- Fritz Perls
- Christopher Peterson
- Jean Piaget, Piagetian psychology and genetic epistemology
- Steven Pinker
- Robert Plomin
- Michael Posner
- Jonathan Potter
- James W. Prescott
Read more about this topic: List Of Psychologists