Gary Cox (born 1964, England) is a British philosopher and biographer and the author of several books on Jean-Paul Sartre, existentialism, general philosophy, ethics and philosophy of sport. A Philosophy graduate of the University of Southampton, UK, in 1988, he was awarded his PhD in 1996 from the University of Birmingham, UK, for his thesis on Jean-Paul Sartre's theory of consciousness, freedom and bad faith and is an honorary research fellow of that same university. His most notable works to date are The Sartre Dictionary (2008), How to Be an Existentialist, or How to Get Real, Get a Grip and Stop Making Excuses (2009), The God Confusion: Why Nobody Knows the Answer to the Ultimate Question (2013) and How to Be Good, or How to Be Moral and Virtuous in a Wicked World (2020).