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600 BCE
Lao-Tzu (also Laozi, lived between the 6th and 4th century BCE)
Historians differ on exactly when Lao-Tzu lived and taught, but it’s largely held that some time between the 6th and 4th centuries BCE, the “old master” founded philosophical Taoism. Viewed as a divine figure in traditional Chinese religions, his ideas and writings would form one of the major pillars (alongside Confucius and the Buddha) for Eastern thought. Lao-Tzu espoused an ideal life lived through the Dao or Tao (roughly translated as “the way”). -
551 BCE
Confucius (551–479 BCE)
Chinese teacher, writer, and philosopher Confucius viewed himself as a channel for the theological ideas and values of the imperial dynasties that came before him. With an emphasis on family and social harmony, Confucius advocated for a way of life that reflected a spiritual and religious tradition, but which was also distinctly humanist and even secularist. -
470 BCE
Socrates (470–399 BCE)
A necessary inclusion by virtue of his role as, essentially, the founder of Western Philosophy, Socrates is nonetheless unique among entrants on this list for having produced no written works reflecting his key ideas or principles. Thus, the body of his thoughts and ideas is left to be deciphered through the works of his two most prominent students, Plato and Xenophon, as well as to the legions of historians and critics who have written on him since. -
428 BCE
Plato (428–348 BCE)
Greek philosopher and teacher Plato did nothing less than found the first institution of higher learning in the Western World, establishing the Academy of Athens and cementing his own status as the most important figure in the development of western philosophical tradition. -
384 BCE
Aristotle (384–322 BCE)
Aristotle is among the most important and influential thinkers and teachers in human history, often considered — alongside his mentor, Plato — to be a father of Western Philosophy.” Born in the northern part of ancient Greece, his writings and ideas on metaphysics, ethics, knowledge, and methodological inquiry are at the very root of human thought. -
1225
Saint Thomas Aquinas (1225–1274)
Thomas Aquinas was a 13th century Dominican friar, theologian and Doctor of the Church, born in what is known today as the Lazio region of Italy. His most important contribution to Western thought is the concept of natural theology (sometimes referred to as Thomism in tribute to his influence). This belief system holds that the existence of God is verified through reason and rational explanation, as opposed to through scripture or religious experience. -
1469
Niccolo Machiavelli (1469–1527)
Niccolo di Bernardo dei Machiavelli is at once among the most influential and widely debated of history’s thinkers. A writer, public office-holder, and philosopher of Renaissance Italy, Machiavelli both participated in and wrote prominently on political matters, to the extent that he has even been identified by some as the father of modern political science. -
René Descartes (1596–1650)
A French philosopher, mathematician, and scientist, Descartes was born in France but spent 20 years of his life in the Dutch Republic. As a member of the Dutch States Army, then as the Prince of Orange and subsequently as Stadtholder (a position of national leadership in the Dutch Republic). Descartes wielded considerable intellectual influence over the period known as the Dutch Golden Age. He often distinguished himself by refuting or attempting to undo the ideas of those that came before him. -
John Locke (1632–1704)
An English physicist and philosopher, John Locke was a prominent thinker during the Enlightenment period. Part of the movement of British Empiricism alongside fellow countrymen David Hume, Thomas Hobbes, and Sir Francis Bacon, Locke is regarded as an important contributor to the development of the social contract theory and is sometimes identified as the father of liberalism. -
David Hume (1711–77)
A Scottish-born historian, economist, and philosopher, Hume is often grouped with thinkers such as John Locke, Thomas Hobbes, and Sir Francis Bacon as part of a movement called British Empiricism. He was focused on creating a “naturalistic science of man” that delves into the psychological conditions defining human nature. In contrast to rationalists such as Descartes, Hume was preoccupied with the way that passions (as opposed to reason) govern human behavior. -
Jean-Jacques Rousseau (1712–78)
Rousseau was a writer, philosopher, and — unique among entrants on this list — a composer of operas and classical compositions. Born in Geneva, then a city-state in the Swiss Confederacy, Rousseau would be one of the most consequential thinkers of the Enlightenment era. -
Immanuel Kant (1724–1804)
Prussian-born (and therefore identified as a German philosopher), Kant is considered among the most essential figures in modern philosophy, an advocate of reason as the source for morality, and a thinker whose ideas continue to permeate ethical, epistemological, and political debate. -
Ralph Waldo Emerson (1803 82)
A Boston-born writer, philosopher, and poet, Ralph Waldo Emerson is the father of the transcendentalist movement. This was a distinctly American philosophical orientation that rejected the pressures imposed by society, materialism, and organized religion in favor of the ideals of individualism, freedom, and a personal emphasis on the soul’s relationship with the surrounding natural world. -
John Stuart Mill (1806–73)
British economist, public servant, and philosopher John Stuart Mill is considered a linchpin of modern social and political theory. He contributed a critical body of work to the school of thought called liberalism, an ideology founding on the extension of individual liberties and economic freedoms. -
Søren Kierkegaard (1813–55)
A Danish theologian, social critic, and philosopher, Kierkegaard is viewed by many as the most important existentialist philosopher. His work dealt largely with the idea of the single individual. His thinking tended to prioritize concrete reality over abstract thought. He focused on the importance of the individual’s subjective relationship with God, and his work addressed the themes of faith, Christian love, and human emotion. -
Karl Marx (1818–83)
A German-born economist, political theorist, and philosopher, Karl Marx wrote some of the most revolutionary philosophical content ever produced. Indeed, so pertinent was his writing to the human condition during his lifetime, he was exiled from his native country. Marx predicted that the inequalities and violence inherent in capitalism would ultimately lead to its collapse. -
Friedrich Nietzsche (1844–1900)
Friedrich Nietzsche was a poet, cultural critic, and philosopher, as well as possessor of among the most gifted minds in human history. The German thinker’s system of ideas would have a profound impact on the Western World, contributing deeply to intellectual discourse both during and after his life. -
Ludwig Wittgenstein (1889–1951)
Born in Austria to a wealthy family, Wittgenstein is one of philosophy’s more colorful and unusual characters. He lived a life of eccentricity and professional nomadism, dabbling in academia, military service, education, and even as a hospital orderly. Moreover, during his life, he wrote voluminously but published only a single manuscript. And yet, he was recognized by his contemporaries as a genius. -
Jean-Paul Sartre (1905–80)
A French novelist, activist, and philosopher, Sartre was a leading exponent of the 20th century existentialist movement as well as a vocal proponent of Marxism and socialism. He advocated for resistance to oppressive social constructs and argued for the importance of achieving an authentic way of being. -
Michel Foucault (1926-1984)
Historian, social theorist, and philosopher Michel Foucault, born in the riverfront city of Poiltiers, France, dedicated much of his teaching and writing to the examination of power and knowledge and their connection to social control. Though often identified as a postmodernist, Foucault preferred to think of himself as a critic of modernity.
