- Jean-Paul Sartre
- Simone de Beauvoir
- Immanuel Kant
- Michel Foucault
- John Stuart Mill
- Eduardo Galeano
- John Dewey
- Octavio Paz
- John Miller Dow Meiklejohn
- Georg Wilhelm Friedrich Hegel
- Francis Bacon
- Leon Trotsky
- Theodor W. Adorno
- Walter Benjamin
- Roger S. Gottlieb
- David B. Morris
- Daniel Guérin
- Sanford Krolick
- David Salner
- Slavoj Žižek