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Philosophers

Mortimer Adler
Rogers Albritton
Alexander of Aphrodisias
Samuel Alexander
G.E.M.Anscombe
Anselm
Louise Antony
Thomas Aquinas
Aristotle
David Armstrong
Harald Atmanspacher
Augustine
J.L.Austin
A.J.Ayer
Alexander Bain
Mark Balaguer
Jeffrey Barrett
William Belsham
Henri Bergson
Isaiah Berlin
Bernard Berofsky
Robert Bishop
Susanne Bobzien
Emil du Bois-Reymond
Hilary Bok
George Boole
Émile Boutroux
F.H.Bradley
C.D.Broad
C.A.Campbell
Joseph Keim Campbell
Carneades
Ernst Cassirer
David Chalmers
Roderick Chisholm
Chrysippus
Cicero
Randolph Clarke
Samuel Clarke
Anthony Collins
Antonella Corradini
Diodorus Cronus
Jonathan Dancy
Donald Davidson
Mario De Caro
Democritus
Daniel Dennett
Jacques Derrida
René Descartes
Richard Double
Fred Dretske
John Dupré
John Earman
Laura Waddell Ekstrom
Epictetus
Epicurus
Herbert Feigl
John Martin Fischer
Owen Flanagan
Luciano Floridi
Philippa Foot
Alfred Fouilleé
Harry Frankfurt
Richard L. Franklin
Michael Frede
Carl Ginet
Nicholas St. John Green
H.Paul Grice
Ian Hacking
Ishtiyaque Haji
Stuart Hampshire
W.F.R.Hardie
William Hasker
R.M.Hare
Georg W.F. Hegel
Martin Heidegger
R.E.Hobart
Thomas Hobbes
David Hodgson
Shadsworth Hodgson
Ted Honderich
Pamela Huby
David Hume
Ferenc Huoranszki
William James
Lord Kames
Robert Kane
Immanuel Kant
Tomis Kapitan
Jaegwon Kim
William King
Christine Korsgaard
Andrea Lavazza
Keith Lehrer
Gottfried Leibniz
Leucippus
Michael Levin
George Henry Lewes
C.I.Lewis
David Lewis
Peter Lipton
John Locke
Michael Lockwood
E. Jonathan Lowe
John R. Lucas
Lucretius
James Martineau
Storrs McCall
Hugh McCann
Colin McGinn
Michael McKenna
Brian McLaughlin
Paul E. Meehl
Uwe Meixner
Alfred Mele
John Stuart Mill
Dickinson Miller
G.E.Moore
C. Lloyd Morgan
Thomas Nagel
Friedrich Nietzsche
John Norton
P.H.Nowell-Smith
Robert Nozick
William of Ockham
Timothy O'Connor
David F. Pears
Charles Sanders Peirce
Derk Pereboom
Steven Pinker
Plato
Karl Popper
Huw Price
H.A.Prichard
Hilary Putnam
Willard van Orman Quine
Frank Ramsey
Ayn Rand
Thomas Reid
Charles Renouvier
Nicholas Rescher
C.W.Rietdijk
Richard Rorty
Josiah Royce
Bertrand Russell
Paul Russell
Gilbert Ryle
Kenneth Sayre
T.M.Scanlon
Moritz Schlick
Arthur Schopenhauer
John Searle
Wilfrid Sellars
Henry Sidgwick
Walter Sinnott-Armstrong
J.J.C.Smart
Saul Smilansky
Michael Smith
L. Susan Stebbing
George F. Stout
Galen Strawson
Peter Strawson
Eleonore Stump
Richard Taylor
Kevin Timpe
Mark Twain
Peter van Inwagen
Manuel Vargas
John Venn
Kadri Vihvelin
Voltaire
G.H. von Wright
David Foster Wallace
R. Jay Wallace
W.G.Ward
Ted Warfield
Roy Weatherford
William Whewell
Alfred North Whitehead
David Widerker
David Wiggins
Bernard Williams
Ludwig Wittgenstein
Susan Wolf

Scientists

Michael Arbib
Bernard Baars
John S. Bell
Charles Bennett
Ludwig von Bertalanffy
Susan Blackmore
Margaret Boden
David Bohm
Niels Bohr
Ludwig Boltzmann
Emile Borel
Max Born
Walther Bothe
Hans Briegel
Leon Brillouin
Stephen Brush
Henry Thomas Buckle
Donald Campbell
Anthony Cashmore
Eric Chaisson
Jean-Pierre Changeux
Arthur Holly Compton
John Conway
E. H. Culverwell
Charles Darwin
Terrence Deacon
Max Delbrück
Abraham de Moivre
Paul Dirac
Hans Driesch
John Eccles
Arthur Stanley Eddington
Paul Ehrenfest
Albert Einstein
Hugh Everett, III
Franz Exner
Richard Feynman
Joseph Fourier
Michael Gazzaniga
GianCarlo Ghirardi
Nicolas Gisin
Paul Glimcher
Thomas Gold
A.O.Gomes
Brian Goodwin
Joshua Greene
Jacques Hadamard
Stuart Hameroff
Patrick Haggard
Augustin Hamon
Sam Harris
Martin Heisenberg
Werner Heisenberg
William Stanley Jevons
Pascual Jordan
Simon Kochen
Stephen Kosslyn
Ladislav Kovàč
Rolf Landauer
Alfred Landé
Pierre-Simon Laplace
David Layzer
Benjamin Libet
Hendrik Lorentz
Josef Loschmidt
Ernst Mach
Henry Margenau
James Clerk Maxwell
Ernst Mayr
Ulrich Mohrhoff
Jacques Monod
Wolfgang Pauli
Massimo Pauri
Roger Penrose
Steven Pinker
Max Planck
Susan Pockett
Henri Poincaré
Daniel Pollen
Ilya Prigogine
Hans Primas
Adolphe Quételet
Jerome Rothstein
David Ruelle
Erwin Schrödinger
Aaron Schurger
Claude Shannon
Herbert Simon
Dean Keith Simonton
B. F. Skinner
Roger Sperry
Henry Stapp
Antoine Suarez
Leo Szilard
William Thomson (Kelvin)
Peter Tse
John von Neumann
Daniel Wegner
Steven Weinberg
Paul A. Weiss
Norbert Wiener
Eugene Wigner
E. O. Wilson
H. Dieter Zeh
Ernst Zermelo
Wojciech Zurek
 
Susanne Bobzien
Susanne Bobzien is Professor of Philosophy at Yale specializing in the problem of determinism and freedom, especially among Hellenistic and later ancient philosophers.

Her 1998 book Determinism and Freedom in Stoic Philosophy is a detailed analysis of arguments, especially those of Chrysippus, for the compatibilism of freedom with causal determinism.

In her book and a 1998 article in Phronesis (Vol. 43, No. 2 (May, 1998), pp. 133-175), Bobzien identified several variations on the theme of human freedom that were important in antiquity. Three of them are indeterminist freedoms, by which she means the decision is partly or wholly a matter of chance, and does not involve the character and values of the agent. (These are "extreme" libertarian positions, but are held today by Robert Kane, Mark Balaguer, and others):

1) freedom to do otherwise: I am free to do otherwise if, being the same agent, with the same desires and beliefs, and being in the same circumstances, it is possible for me to do or not to do something in the sense that it is not fully causally determined whether or not I do it.

2) freedom of decision: a subtype of freedom to do otherwise. I am free in my decision, if being the same agent, with the same desires and beliefs, and being in the same circumstances, it is possible for me to decide between alternative courses of action in the sense that it is not fully causally determined which way I decide. 1) differs from 2) in that it leaves it undecided in which way it is possible for the agent to do or not to do something.

3) freedom of the will: a subtype of freedom of decision. I act from free will, if I am in the possession of a will, i.e. a specific part or faculty of the soul by means of which I can decide between alternative courses of actions independently of my desires and beliefs [this is "extreme"], in the sense that it is not fully causally determined in which way I decide. 2) differs from 3) in that the latter postulates a specific causally independent faculty or part of the soul which functions as a "decision making faculty."
(Phronesis, p.133)

Bobzien contrasts these radical libertarianisms with what she calls "un-predeterminist" freedom:
4) un-predeterminist freedom: I have un-predeterminist freedom of action/choice if there are no causes prior to my action/choice which determine whether or not I perform/choose a certain course of action, but in the same circumstances, if I have the same desires and beliefs, I would always do/choose the same thing. Un-predeterminist freedom guarantees the agents' autonomy in the sense that nothing except the agents themselves is causally responsible for whether they act, or for which way they decide. Un-predeterminist freedom requires a theory of causation that is not (just) a theory of event-causation (i.e. a theory which considers both causes and effects as events). For instance, un-predeterminist freedom would work with a concept of causality which considers things or objects (material or immaterial) as causes, and events, movements or changes as effects. Such a conception of causation is common in antiquity.
(Phronesis, p.133)
In Bobzien's "un-predeterminist" freedom, there is nothing that causally determines the agent's action, but the agent will always make the same decision in exactly the same circumstances, because the decision is completely consistent with the agent's desires and beliefs (and character and values).

Bobzien's idea of un-predeterminist freedom is a good fit with two-stage models of free will.

Finally, Bobzien lists three compatibilist freedoms, negative "freedoms from" rather than positive "freedoms to..."

5) freedom from force and compulsion: I am free in my actions/choices in this sense, if I am not externally or internally forced or compelled when I act/choose. This does not preclude that my actions/choices may be fully causally determined by extemal and internal factors.

6) freedom from determination by external causal factors: agents are free from external causal factors in their actions/choices if the same external situation or circumstances will not necessarily always elicit the same (re-)action or choice of different agents, or of the same agent but with different desires or beliefs.

7) freedom from determination by (external and) certain internal causal factors: I am in my actions/choices free from certain intemal factors (e.g. my desires), if having the same such internal factors will not necessarily always elicit in me the same action/choice.
(Determinism and Freedom in Stoic Philosophy, p.278)

In Oxford Studies in Ancient Philosophy (2000), Bobzien challenged Pamela Huby's 1967 assertion that Epicurus discovered the "free will problem."
In 1967 Epicurus was credited with the discovery of the problem of free will and determinism. Among the contestants were Aristotle and the early Stoics.
Furley merely de-emphasized the direct involvement of the random swerve in volition, as had Bailey before him.
Epicurus emerged victorious, because — so the argument went — Aristotle did not yet have the problem, and the Stoics inherited it from Epicurus. In the same year David Furley published his essay 'Aristotle and Epicurus on Voluntary Action', in which he argued that Epicurus' problem was not the free will problem. In the thirty-odd years since then, a lot has been published about Epicurus on freedom and determinism.

But it has only rarely been questioned whether Epicurus, in one way or another, found himself face to face with some version of the free will problem. In this paper I intend to take up the case for those who have questioned the point, combining a fresh perspective on the debate with a selection of new arguments and a detailed textual analysis of the relevant passages. Let me begin with a brief sketch of the problem of freedom and determinism which Epicurus is widely taken to have been concerned with.

The determinism Epicurus defends himself against is usually understood as causal determinism: every event is fully determined in all its details by preceding causes. These causes are commonly pictured as forming an uninterrupted chain or network, reaching back infinitely into the past, and as governed by an all-embracing set of laws of nature, or as manifestations of such a set of laws of nature.

Freedom to do otherwise, freedom of decision, and extreme freedom of the will Bobzien now labels "two-sided" freedom
On the side of freedom, Epicurus is generally understood to have been concerned with freedom of decision (the freedom to decide whether or not to do some action) or freedom of choice (the freedom to choose between doing and not doing some action) or freedom of the will (where the freedom to will to do something entails the freedom to will not to do it, and vice versa; I call this two-sided freedom of the will). Epicurus is taken to have introduced an indeterminist conception of free decision or free choice or two-sided free will: agents are free in this sense only if they are causally undetermined (or not fully causally determined) in their decision whether or not to act or their choice between alternative courses of action; undetermined, that is, by external and internal causal factors alike. There is assumed to be a gap in the causal chain immediately before, or simultaneously with, the decision or choice, a gap which allows the coming into being of a spontaneous motion.
Epicurus did not make actions directly the result of random atomic swerves, and he did think volitions were "up to us."
In this way every human decision or choice is directly linked with causal indeterminism. The assumption of such indeterminist free decision, free choice, or two-sided free will does not presuppose that one specifies an independent mental faculty, like e.g. a will, and indeed it is not usually assumed that Epicurus' theory involved such a faculty.

The 'free will problem' that Epicurus is assumed to have faced is then roughly as follows: If determinism is true, every decision or choice of an agent between alternative courses of actions is fully determined by preceding causes, and forms part of an uninterrupted causal chain. On the other hand, if an agent has (two-sided) freedom of the will, it seems that the agent's decision or choice must not be fully determined by preceding causes. Hence, it appears, determinism and freedom of the will (freedom of decision, freedom of choice) are incompatible.

I do not believe that Epicurus ever considered a problem along the lines of the one just described. In particular, I am sceptical about the assumption that he shared in a conception of free decision or free choice akin to the one I have sketched. (I also have my doubts that he ever conceived of a determinism characterized by a comprehensive set of laws of nature; but this is a point I only mention in passing.) To avoid misunderstandings, I should stress that I do believe that Epicurus was an indeterminist of sorts — only that he did not advocate indeterminist free decision or indeterminist free choice.

Bobzien is of course right that Epicurus did not think that our decisions were made at random with no regard for our character and values, or for our feelings and desires. This is a straw argument put up by critics of Epicurean philosophy, notably the Stoic Chryssipus and the Academic Skeptic Cicero.

Epicurus explicitly said human actions are caused by an autonomous agency, a third cause beyond chance and necessity.

But Bobzien is wrong to suggest that Epicurus did not see a problem between human freedom and the causal determinism of his fellow atomist Democritus, and that Epicurus' atomic swerve was not his proposed solution to that "free will problem (viz, by breaking the causal chain)." Bobzien recognizes that her claim depends on the definiton of free will when she notes that

Whether Epicurus discussed free will depends on what one means by 'free will'. For example, if one intends 'free will' to render Lucretius "libera voluntas," and to mean whatever element of Epicurus' doctrine Lucretius meant to capture by this phrase, then Epicurus evidently was concerned with free will. My concern is only to show that he did not discuss a problem of free will that involves a conception of freedom of decision or choice as adumbrated in the main text. [namely, "extreme" libertarianism in which chance is the direct cause of action.]

See our account of free will in antiquity for more details and which ancient philosophers were first to take positions as determinist, libertarian, and compatibilist in antiquity.

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