David Hume
Nicholas Capaldi
Georg Wilhelm Friedrich Hegel
John E. Smith
Friedrich Nietzsche
Richard Schacht
Immanuel Kant
A. J. Mandt
John Dewey
John J. Stuhr
Jean-Paul Sartre
John Compton
Plato
Berel Lang
St. Augustine
R. J. O'Connell
Søren Kierkegaard
George Connell
St. Thomas Aquinas
Kenneth L. Schmitz
Baruch Spinoza
Thomas Cook
Arthur Schopenhauer
Mark Stone