Alan Ryan

Sir James Mackintosh

Francisco Suárez

Brian Kogelmann

Bas van der Vossen

Gershom Carmichael

Virginia Postrel

Immanuel Kant

Jan Narveson

David W. Carrithers

James Mill

Alexander Broadie

Plotinus

David Conway

Benjamin Hoffmann

Paul Carus

Mary Campbell Smith

Helmut Schoeck

Rachel Ferguson

Douglas Den Uyl

Michael Polanyi

St. Thomas Aquinas

William George Pogson Smith

Aaron Garrett

Jeremy Bentham

Anthony Ashley Cooper, Earl of Shaftesbury

Carlo Lottieri

Titus Lucretius Carus

Andrea Branchi

Brian Satterfield

René Descartes

Aeon J. Skoble

Plutarch