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Luigi Turco is Professor of Philosophy at the University of Bologna.
Douglas Den Uyl
Francis Hutcheson
Peter Carl Mentzel
John Locke
Alexander Broadie
Joseph Rickaby, S.J.
Benedict de Spinoza
Helmut Schoeck
Michael Huemer
Peter Vallentyne
Chuang Tzu
Francisco Suárez
David W. Carrithers
Plato
Michel de Montaigne
Roderick T. Long
Ayn Rand
Plutarch
Jennifer A. Frey
Ralph McInerny
Immanuel Kant
Rhazes
Aeon J. Skoble
Jeremy Shearmur
Stuart D. Warner
Boethius
Matt Zwolinski
Eric Mack
John Passmore
Thomas Hobbes
Ralph C. Hancock
Bas van der Vossen