“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.

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.

A pioneering figure in analytic philosophy, Ludwig Wittgenstein (1889-1951) is a clear example of philosophical genius. A profoundly intense, tortured, and solitary man, he produced two masterpieces of philosophy with fundamentally opposed views of language — both of which have been wildly influential. Peter Hacker introduces us to perhaps the most important philosopher since Kant, and explains why Wittgenstein would be horrified by Noam Chomsky.

As Confucianism makes a comeback in China, Daniel A. Bell, a professor of philosophy at Tsinghua University in Beijing, lists which books to read for an understanding of Confucius and his legacy.

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.”

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.

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.

The classical Greek philosopher is credited with laying the foundation of Western philosophy – without ever having written a word. Here, the eminent scholar M M McCabe recommends the best books to read to understand Socrates and engage with the eternal question: How best to live?

Plato expert Professor Melissa Lane chooses the best Plato books to help us understand him. He came from a politically active family, but renounced politics to become a philosopher. Or did he?

Hume had a message he wanted to get out — particularly as regards skepticism about religion — but he was no proto-Richard Dawkins, says Cambridge philosopher, Simon Blackburn. He chooses the best books on (or by) David Hume.

Relativist, atheist, existentialist, Nazi. All have been said of Nietzsche, some with more reason than others. We asked a Nietzsche expert to explain the appeal of the controversial philosopher and to recommend Nietzsche books.