- Richard Dawkins
- Friedrich Nietzsche
- Christopher Hitchens
- Friedrich Engels
- Albert Einstein
- Gareth Stedman Jones
- Sam Harris
- Bertrand Russell
- Jean-Jacques Rousseau
- René Descartes
- Thomas More
- Matt Ridley
- David Hume
- William James
- Herodotus
- James D. Watson
- Lawrence M. Krauss
- Paul Ekman
- Baruch Spinoza
- Galileo Galilei