- Nathaniel Branden
- Ludwig von Mises
- Isaiah Berlin
- Todd G. Buchholz
- Barry M. Goldwater
- Robert Hessen
- Louis V. Gerstner Jr.
- Robert Nozick
- Michael Mandelbaum
- James Hutton
- Michael R. Solomon
- Murray N. Rothbard
- David Sirota
- Erwin Chemerinsky
- Yale Kamisar
- A. James Barnes
- Jane P. Mallor
- Maryanne Wolf
- Aurelio Peccei
- Αριστοτέλης