The breadth and diversity of psychology can be seen by looking at some of its best-known thinkers. While each theorist may have been part of an overriding school of thought, each brought a unique perspective to the field of psychology.

The list below provides a snapshot of the careers of 10 leading psychologists and their most important contributions to the field. Developed using the rigorously generated study of "The 100 Most Eminent Psychologists of the 20th Century" as a guide,﻿﻿ this list is by no means exhaustive. Instead, the purpose of this list is to offer a glimpse into some of the major theoretical outlooks that have influenced not only psychology but also the larger culture.