Avicenna

Philosopher · 384 BC – 322 BC

Aristotle was a Greek philosopher and polymath whose writings on logic, ethics, biology, politics and metaphysics shaped Western thought for over two millennia.

• Formal logic
• Virtue ethics

Why Avicenna built his philosophy on Aristotle, whose works he interpreted for the Islamic world.

Theologian · 1225 – 1274

Thomas Aquinas was a medieval Italian theologian and philosopher whose synthesis of Christian theology and Aristotelian philosophy became central to Catholic thought and the high point of scholasticism.

• Summa Theologica
• Reconciling faith and reason

Why Avicenna's metaphysics and arguments deeply influenced later scholastic theologians like Aquinas.

Philosopher · 1126 – 1198

Averroes was a philosopher and polymath of Al-Andalus whose commentaries on Aristotle profoundly shaped medieval European philosophy and the relationship between reason and faith.

• Commentaries on Aristotle
• Defending reason and philosophy

Why A fellow great philosopher of the Islamic world who also interpreted Aristotle.

Physician · 460 BC – 370 BC

Hippocrates was an ancient Greek physician regarded as the father of Western medicine, who established medicine as a rational discipline distinct from superstition and inspired the Hippocratic Oath.

• Father of medicine
• The Hippocratic Oath

Why The Greek father of medicine whose tradition Avicenna systematized and advanced.

Philosopher · 1561 – 1626

Francis Bacon was an English philosopher, statesman and writer who served as Lord Chancellor and, in works such as the Novum Organum and his Essays, founded the modern scientific method of reasoning from evidence and experiment.

• Scientific method
• Novum Organum

Why Also a philosopher & scientist · Comparable historical impact

Philosopher · 1632 – 1704

John Locke was an English philosopher and physician, widely regarded as the father of liberalism, whose theories of empiricism, natural rights, and government by consent shaped the Enlightenment and the founding of modern democracies.

• Empiricism
• Natural rights

Why Also a philosopher & physician · Comparable historical impact

Artist · 1452 – 1519

Leonardo da Vinci was an Italian Renaissance polymath — painter, inventor, anatomist and engineer — whose curiosity and genius made him the archetype of the 'Renaissance man'.

• Mona Lisa
• The Last Supper

Why Also a polymath & scientist · Comparable historical impact

Economist · 1723 – 1790

Adam Smith was a Scottish Enlightenment philosopher and economist, the father of modern economics, whose work The Wealth of Nations laid the foundations of free-market thought.

• The Wealth of Nations
• The invisible hand

Why Also a philosopher · Comparable historical impact

Writer · 1894 – 1963

Aldous Huxley was an English writer and philosopher whose dystopian novel Brave New World became one of the most influential warnings of the 20th century, imagining a future enslaved not by terror but by pleasure and conditioning.

• Brave New World
• The Doors of Perception

Why Also a philosopher · Comparable historical impact

Theologian · 354 – 430

Augustine of Hippo was a Roman North African theologian and philosopher whose works, including Confessions and City of God, shaped Western Christianity and laid intellectual foundations for medieval and modern thought.

• Confessions
• City of God

Why Also a philosopher · Comparable historical impact

Philosopher · 1596 – 1650

René Descartes was a French philosopher, mathematician and scientist, the "father of modern philosophy", famous for "I think, therefore I am" and for founding analytic geometry.

• I think, therefore I am
• Analytic geometry

Why Also a philosopher & scientist · Worked in philosophy

Mathematician · 780 – 850

Al-Khwarizmi was a Persian mathematician and scholar of the Islamic Golden Age, the "father of algebra", whose name gave us the word "algorithm".

• Founding algebra
• The word 'algorithm'

Why Also a scientist · Worked in astronomy

Mathematician · 360 – 415

Hypatia was a mathematician, astronomer and Neoplatonist philosopher of late-antique Alexandria, the most prominent woman scholar of the ancient world, whose brutal murder came to symbolize the end of classical learning.

• Leading the Neoplatonist school of Alexandria
• Mathematics and astronomy

Why Also a philosopher · Worked in astronomy & philosophy

Composer · 1098 – 1179

Hildegard of Bingen was a German Benedictine abbess and one of the most remarkable polymaths of the Middle Ages — a visionary, composer, writer, healer and natural philosopher.

• Visionary theology
• Sacred music

Why Also a polymath · Worked in medicine

Philosopher · 1724 – 1804

Immanuel Kant was a German philosopher of the Enlightenment, one of the most influential thinkers in history, who reconciled rationalism and empiricism and transformed ethics, metaphysics and epistemology.

• Critique of Pure Reason
• The categorical imperative

Why Also a philosopher · Worked in philosophy

Chemist · 1822 – 1895

Louis Pasteur was a French chemist and microbiologist whose work on germ theory, vaccination, and pasteurization revolutionized medicine and saved countless lives.

• Germ theory of disease
• Pasteurization

Why Also a scientist · Worked in medicine

Writer · 1759 – 1797

Mary Wollstonecraft was an English Enlightenment writer and philosopher, a pioneer of feminist thought whose A Vindication of the Rights of Woman argued for the education and equality of women.

• A Vindication of the Rights of Woman
• Founding feminist philosophy

Why Also a philosopher · Worked in philosophy

Writer · 1694 – 1778

Voltaire was a French Enlightenment writer, philosopher and wit, a tireless champion of reason, free speech and religious tolerance and one of the most influential figures of his age.

• Candide
• Defending free speech and tolerance

Why Also a philosopher · Worked in philosophy

Philosopher · 334 BC – 262 BC

Zeno of Citium was an ancient Greek philosopher who founded Stoicism, teaching that virtue and reason are the path to a good life, in lectures given at the Painted Porch (Stoa) in Athens.

• Founding Stoicism
• Teaching at the Stoa

Why Also a philosopher · Worked in logic

Astronomer · 1934 – 1996

Carl Sagan was an American astronomer and planetary scientist who became the world's most famous communicator of science, reaching millions through the television series Cosmos and best-selling books that made him a celebrated author as well as a researcher.

• Cosmos
• Science communication

Why Also a scientist · Worked in astronomy

Astronomer · 1564 – 1642

Galileo Galilei was an Italian astronomer, physicist and engineer, the "father of modern science", whose telescopic discoveries and championing of heliocentrism transformed our understanding of the cosmos.

• Telescopic astronomy
• Defending heliocentrism

Why Also a scientist · Worked in astronomy

Astronomer · 1473 – 1543

Nicolaus Copernicus was a Renaissance astronomer who formulated the heliocentric model placing the Sun, not the Earth, at the center of the universe — a revolution in human thought.

• The heliocentric model
• The Copernican Revolution

Why Also a scientist · Worked in astronomy

Psychologist · 1856 – 1939

Sigmund Freud was an Austrian neurologist who founded psychoanalysis, a revolutionary theory and therapy of the unconscious mind whose ideas about dreams, sexuality and the self transformed psychology, medicine and modern culture.

• Psychoanalysis
• Theory of the unconscious

Why Also a physician · Worked in medicine

Historian · 1332 – 1406

Ibn Khaldun was a North African scholar of the 14th century widely regarded as a founder of historiography, sociology and economics, whose Muqaddimah pioneered the analytical study of how societies rise and fall.

• The Muqaddimah
• Theory of asabiyyah

Why Also a philosopher · Active in the same era