He was one of the great intellectuals of the 20th century, but a people person with little interest in publishing books. Henry Hardy, the editor who helped publish many of them, chooses the best books by (and one about) Isaiah Berlin.

The eighteenth-century philosopher wielded his powers of ridicule and witticism against religious fanatics—but always championed free speech and religious toleration. He was also a historian, scientist, poet, playwright, and political activist. Nicholas Cronk, General Editor of the Complete Works of Voltaire gives a detailed look at the polymathic philosophe.

The 18th century composer, writer and philosopher spent his latter years "alone upon the earth, having no brother, or neighbour, or friend, or society but myself". But he only had himself to blame, says philosophy professor and Rousseau scholar Chris Bertram. Here, he chooses the best five books on this complex man's life and work.

G W F Hegel is one of the most divisive figures in western philosophy. He influenced Marx, Kierkegaard, Nietzsche, Sartre, Adorno and countless others. And yet, he is seen as perhaps the most obscure and inaccessible philosopher to read. Is he worth engaging with? How should we read him? Stephen Houlgate, a philosopher at Warwick University, gives us an in-depth look at Hegel.

Adam Smith tends to be seen as the founder of capitalism and modern economics, but he was, first and foremost, a moral philosopher. Dennis Rasmussen, author of The Infidel and the Professor—a book about Smith's friendship with David Hume—selects the best books by and about Adam Smith.

Immanuel Kant was born in Königsberg, lived in Königsberg, and never travelled very far from Königsberg—but his mind ranged across vast territories, says Oxford philosophy professor Adrian Moore. He selects five key texts for coming to grips with the work of "the greatest philosopher of all time."

Arthur Schopenhauer was a German philosopher who held a deeply pessimistic view of the world. He was also, among other things, a misogynist. And yet, he made important contributions to a number of areas of philosophy and had a deep influence on other philosophers. He wrote in a clear style that gained him a wide readership among non-philosophers as well. David Bather Woods, a Schopenhauer expert at the University of Warwick, talks us through his choice of books on the life and work of this remarkable thinker.

“It’s not surprising that he died at forty-two, because he burned himself out restlessly, relentlessly pursuing this question of how to be a human being.” Søren Kierkegaard's latest biographer Clare Carlisle recommends five books for understanding the Danish philosopher's life and work—and shows how his work often bears witness to the complex, fraught experience of being alive.

Few people have had their ideas reinvented as many times as the German intellectual and political activist, Karl Marx. Professor of political theory, Terrell Carver, takes us through the most influential books, in English, about Marx, Marxism and his friend, publicist and financial backer, Friedrich Engels.

Albert Camus was born in northern Algeria in extreme poverty, but went on to become one of the best-known French philosophers of the 20th century. In 1957, he won the Nobel Prize in Literature for illuminating "the problems of the human conscience in our times." Here, Camus expert Jamie Lombardi talks us through the books that best capture his work and the moral dilemmas he sought to explore.