Friedrich Wilhelm Nietzsche (October 15, 1844 – August 25, 1900), born in Prussian Saxony and publishing in German between 1872 and 1888, became an important philosopher and philologist. He wrote critical texts on religion, morality, contemporary culture, philosophy, and science, using a distinctive German language style and displaying a fondness for aphorism. Nietzsche's influence remains substantial within and beyond philosophy, notably in existentialism and postmodernism. His style and radical questioning of the value and objectivity of truth raise considerable problems of interpretation, generating an extensive secondary literature in both continental and analytic philosophy. Nonetheless, his key ideas include interpreting tragedy as an affirmation of life, an eternal recurrence (which numerous commentators have re-interpreted), a rejection of Platonism, and a repudiation of (especially 19th-century) Christianity.

Nietzsche began his career as a classical philologist before turning to philosophy. At the age of 24 he became the Chair of Classical Philology at the University of Basel (the youngest-ever holder of this position), but resigned in 1879 due to health problems, which would plague him for most of his life. In 1889 he exhibited symptoms of a serious mental illness, living out his remaining years in the care of his mother and sister until his death in 1900.

Ludwig Josef Johann Wittgenstein (April 26, 1889 – April 29, 1951) was an Austrian philosopher who worked primarily in the foundations of logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. His influence has been wide-ranging and he is generally regarded as one of the twentieth century's most important philosophers.

Before his death at the age of 62, the only book-length work Wittgenstein had published was the Tractatus Logico-Philosophicus. Philosophical Investigations, which Wittgenstein worked on in his later years, was published shortly after he died. Both of these works are regarded as highly influential in analytic philosophy.

Theodor Ludwig Wiesengrund Adorno (September 11, 1903 – August 6, 1969) was a German sociologist, philosopher, musicologist, and composer. He was a member of the Frankfurt School along with Max Horkheimer, Walter Benjamin, Herbert Marcuse, Jürgen Habermas, and others. He was also the Music Director of the Radio Project.

Already as a young music critic and amateur sociologist, Theodor W. Adorno was primarily a philosophical thinker. The label social philosopher emphasizes the socially critical aspect of his philosophical thinking, which from 1945 onwards took an intellectually prominent position in the critical theory of the Frankfurt School.

Georg Wilhelm Friedrich Hegel (August 27, 1770 – November 14, 1831) was a German philosopher, and with Johann Gottlieb Fichte and Friedrich Wilhelm Joseph Schelling, one of the creators of German idealism.

Hegel influenced writers of widely varying positions, including both his admirers (Bauer, Marx, Bradley, Sartre, Küng), and his detractors (Schelling, Kierkegaard, Schopenhauer, Nietzsche, Heidegger, Russell). Hegel discussed a relation between nature and freedom, immanence and transcendence, and the unification of these dualities without eliminating either pole or reducing it to the other. His influential conceptions are of speculative logic or "dialectic," "absolute idealism," "Spirit," the "Master/Slave" dialectic, "ethical life," and the importance of history.

Gottfried Wilhelm Leibniz (July 1 (June 21 Old Style) 1646 – November 14, 1716) was a German polymath who wrote primarily in Latin and French.

He occupies an equally grand place in both the history of philosophy and the history of mathematics. He invented calculus independently of Newton, and his notation is the one in general use since then. He also discovered the binary system, foundation of virtually all modern computer architectures. In philosophy, he is mostly remembered for optimism, i.e. his conclusion that our universe is, in a restricted sense, the best possible one God could have made. He was, along with René Descartes and Baruch Spinoza, one of the three greatest 17th century rationalists, but his philosophy also looks back to the scholastic tradition and anticipates modern logic and analysis. Leibniz also made major contributions to physics and technology, and anticipated notions that surfaced much later in biology, medicine, geology, probability theory, psychology, linguistics, and information science. He also wrote on politics, law, ethics, theology, history, and philology, even occasional verse. His contributions to this vast array of subjects are scattered in journals and in tens of thousands of letters and unpublished manuscripts. To date, there is no complete edition of Leibniz's writings.

Immanuel Kant (22 April 1724 – 12 February 1804) was an 18th-century German philosopher from the Prussian city of Königsberg (now Kaliningrad, Russia). He is regarded as one of the most influential thinkers of modern Europe and of the late Enlightenment.

Karl Theodor Jaspers (February 23, 1883 – February 26, 1969) was a German psychiatrist and philosopher who had a strong influence on modern theology, psychiatry and philosophy.

Friedrich Wilhelm Joseph Schelling (January 27, 1775 – August 20, 1854), later von Schelling, was a German philosopher. Standard histories of philosophy make him the midpoint in the development of German Idealism, situating him between Fichte, his mentor prior to 1800, and Hegel, his former university roommate and erstwhile friend. Interpreting Schelling's philosophy is often difficult because of its ever-changing nature. Some scholars characterize him as a protean thinker who, although brilliant, jumped from one subject to another and lacked the synthesizing power needed to arrive at a complete philosophical system. Others challenge the notion that Schelling's thought is marked by profound breaks, instead arguing that his philosophy always focused on a few common themes, especially human freedom, the absolute, and the relationship between spirit and nature.

Schelling's thought has often been neglected, especially in the English-speaking world. This stems not only from the ascendancy of Hegel, whose mature works portray Schelling as a mere footnote in the development of Idealism, but also from his Naturphilosophie, which positivist scientists have often ridiculed for its "silly" analogizing and lack of empirical orientation.[1] In recent years, Schelling scholars have forcefully attacked both of these sources of neglect.

Ernst Simon Bloch (July 8, 1885 – August 4, 1977) was a German Marxist philosopher.

Bloch was influenced by both Hegel and Marx. He was also interested in music (notably Gustav Mahler) and art (notably expressionism). He established friendships with Georg Lukacs, Bertolt Brecht, Kurt Weill and Theodor W. Adorno. Bloch's work focuses on the concept that in a utopian human world where oppression and exploitation have been eliminated there will always be a truly ideological revolutionary force.

Maximilian Carl Emil Weber (21 April 1864 – 14 June 1920) was a German political economist and sociologist who was considered one of the founders of the modern study of sociology and public administration. He began his career at the University of Berlin, and later worked at Freiburg, Heidelberg, Vienna and Munich. He was influential in contemporary German politics, being an advisor to Germany's negotiators at the Treaty of Versailles and to the commission charged with drafting the Weimar Constitution.

Weber's major works deal with rationalization in sociology of religion and government.[1] His most famous work is his essay The Protestant Ethic and the Spirit of Capitalism, which began his work in the sociology of religion. In this work, Weber argued that religion was one of the non-exclusive reasons for the different ways the cultures of the Occident and the Orient have developed, and stressed importance of particular characteristics of ascetic Protestantism which led to the development of capitalism, bureaucracy and the rational-legal state in the West. In another major work, Politics as a Vocation, Weber defined the state as an entity which claims a monopoly on the legitimate use of physical force, a definition that became pivotal to the study of modern Western political science. His most known contributions are often referred to as the 'Weber Thesis'.

Aristotle (384 BC – 322 BC) was a Greek philosopher, a student of Plato and teacher of Alexander the Great. He wrote on many different subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, politics, government, ethics, biology and zoology.

Aristotle (together with Plato and Socrates, Plato's teacher) is one of the most important founding figures in Western philosophy. He was the first to create a comprehensive system of philosophy, encompassing morality and aesthetics, logic and science, politics and metaphysics. Aristotle's views on the physical sciences profoundly shaped medieval scholarship, and their influence extended well into the Renaissance, although they were ultimately replaced by modern physics. In the biological sciences, some of his observations were only confirmed to be accurate in the nineteenth century. His works contain the earliest known formal study of logic, which were incorporated in the late nineteenth century into modern formal logic. In metaphysics, Aristotelianism had a profound influence on philosophical and theological thinking in the Islamic and Jewish traditions in the Middle Ages, and it continues to influence Christian theology, especially Eastern Orthodox theology, and the scholastic tradition of the Roman Catholic Church. All aspects of Aristotle's philosophy continue to be the object of active academic study today.

Though Aristotle wrote many elegant treatises and dialogues (Cicero described his literary style as "a river of gold"), it is thought that the majority of his writings are now lost; it is believed that only about one third of the original works have survived.

Michel Foucault (15 October 1926–25 June 1984) was a French philosopher, historian, critic and sociologist. He held a chair at the Collège de France, giving it the title "History of Systems of Thought," and taught at the University of California, Berkeley.

Michel Foucault is best known for his critical studies of social institutions, most notably psychiatry, medicine, the human sciences, and the prison system, as well as for his work on the history of human sexuality. Foucault's work on power, and the relationships among power, knowledge, and discourse, has been widely discussed and applied. In the 1960s Foucault was often associated with the structuralist movement. Foucault later distanced himself from structuralism. Sometimes described as postmodernist, Foucault always rejected the post-structuralist and postmodernist labels.