- A major early figure in British Empiricism
- Primarily interested in the nature of the Mind
- a Theist & a Dualist
- ALL ideas are derived from experience, but some "faculties of the mind" are innate
- Developed the notion of "primary" vs. "secondary" qualities of objects
- Thinking & Perceiving are different words for the same process
- He avoided all questions about the physiological basis of thought