- Baruch Spinoza
- George Berkeley
- Henry A. Giroux
- Jeremy Black
- Willard Van Orman Quine
- Dale H. Schunk
- J.H. Elliott
- Frederick Jackson Turner
- S.E. Frost Jr.
- John Heath
- Richard A. Branyon
- Heraclitus
- William R. Myers
- David Berman
- Robert J. Knecht
- Brooks Haxton
- Richard C. Bush
- Wayne L. Gordon
- Daniel Kohanski
- Frederick Gustav Weiss