Humboldt University of Berlin in the context of "Nickel–Strunz classification"

Karl Marx (German: [ˈkaʁl ˈmaʁks]; 5 May 1818 – 14 March 1883) was a German philosopher, political theorist, economist, journalist, and revolutionary socialist. He is best-known for the 1848 pamphlet The Communist Manifesto (written with Friedrich Engels), and his three-volume Das Kapital (1867–1894), a critique of classical political economy which employs his theory of historical materialism in an analysis of capitalism, in the culmination of his life's work. Marx's ideas and their subsequent development, collectively known as Marxism, have had enormous influence.

Born in Trier in the Kingdom of Prussia, Marx studied at the University of Bonn and the University of Berlin, and received a doctoral degree in philosophy from the University of Jena in 1841. A Young Hegelian, he was influenced by the philosophy of Georg Wilhelm Friedrich Hegel, and both critiqued and developed Hegel's ideas in works such as The German Ideology (written 1846) and the Grundrisse (written 1857–1858). While in Paris, Marx wrote his Economic and Philosophic Manuscripts of 1844 and met Engels, who became his closest friend and collaborator. After moving to Brussels in 1845, they were active in the Communist League, and in 1848 they wrote The Communist Manifesto, which expresses Marx's ideas and lays out a programme for revolution. Marx was expelled from Belgium and Germany, and in 1849 moved to London, where he wrote The Eighteenth Brumaire of Louis Bonaparte (1852) and Das Kapital. From 1864, Marx was involved in the International Workingmen's Association (First International), in which he fought the influence of anarchists led by Mikhail Bakunin. In his Critique of the Gotha Programme (1875), Marx wrote on revolution, the state and the transition to communism. He died stateless in 1883 and was buried in Highgate Cemetery.

Maximilian Carl Emil Weber (/ˈveɪbər/; German: [ˈveːbɐ] ; 21 April 1864 – 14 June 1920) was a German sociologist, historian, jurist, and political economist who was one of the central figures in the development of sociology and the social sciences more generally. His ideas continue to influence social theory and research.

Born in Erfurt in 1864, Weber studied law and history in Berlin, Göttingen, and Heidelberg. After earning his doctorate in law in 1889 and habilitation in 1891, he taught in Berlin, Freiburg, and Heidelberg. He married his cousin Marianne Schnitger two years later. In 1897, he had a breakdown after his father died following an argument. Weber ceased teaching and travelled until the early 1900s. He recovered and wrote The Protestant Ethic and the Spirit of Capitalism. During the First World War, he initially supported Germany's war effort but became critical of it and supported democratisation. He also gave the lectures "Science as a Vocation" and "Politics as a Vocation". After the war, Weber co-founded the German Democratic Party, unsuccessfully ran for office, and advised the drafting of the Weimar Constitution. Becoming frustrated with politics, he resumed teaching in Vienna and Munich. He died of pneumonia in 1920 at the age of 56, possibly as a result of the post-war Spanish flu pandemic. A book, Economy and Society, was left unfinished.

The Young Hegelians (German: Junghegelianer), later known as the Left Hegelians (German: Linkshegelianer), were a group of German intellectuals who were active from the late 1830s to the mid-1840s. Their thought represented a radicalization of Georg Wilhelm Friedrich Hegel's philosophy, moving from the analysis of religion to critiques of politics and society that laid the groundwork for socialism and Marxism. A central feature of their work was a critique of what they saw as the intertwined religious, philosophical, and political dogmas of "personalism". The collapse of Hegelian philosophy in the face of political and social realities led the Young Hegelians to formulate the first modern theory of ideology—the idea that abstract thought functions as a justification for or compensation for a deficient social reality.

Centered at the University of Berlin, the group initially focused on theological questions, galvanized by David Strauss's controversial book The Life of Jesus (1835), which treated the Gospels as mythological expressions of the early Christian community's consciousness rather than as historical fact. This led to a split in the Hegelian school between the conservative "Right Hegelians" who defended the compatibility of Hegel's philosophy with orthodox Christianity and the radical "Young Hegelians" who drew increasingly atheistic and anti-religious conclusions.

Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist best known for developing the theory of relativity. Einstein also made important contributions to quantum theory. His mass–energy equivalence formula E = mc, which arises from special relativity, has been called "the world's most famous equation". He received the 1921 Nobel Prize in Physics for "his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect".

Born in the German Empire, Einstein moved to Switzerland in 1895, forsaking his German citizenship (as a subject of the Kingdom of Württemberg) the following year. In 1897, at the age of seventeen, he enrolled in the mathematics and physics teaching diploma program at the Swiss federal polytechnic school in Zurich, graduating in 1900. He acquired Swiss citizenship a year later, which he kept for the rest of his life, and afterwards secured a permanent position at the Swiss Patent Office in Bern. In 1905, he submitted a successful PhD dissertation to the University of Zurich. In 1914, he moved to Berlin to join the Prussian Academy of Sciences and the Humboldt University of Berlin, becoming director of the Kaiser Wilhelm Institute for Physics in 1917; he also became a German citizen again, this time as a subject of the Kingdom of Prussia. In 1933, while Einstein was visiting the United States, Adolf Hitler came to power in Germany. Horrified by the Nazi persecution of his fellow Jews, he decided to remain in the US, and was granted American citizenship in 1940. On the eve of World War II, he endorsed a letter to President Franklin D. Roosevelt alerting him to the potential German nuclear weapons program and recommending that the US begin similar research, later carried out as the Manhattan Project.

James Henry Breasted (/ˈbrɛstɪd/; August 27, 1865 – December 2, 1935) was an American archaeologist, Egyptologist, and historian. After completing his PhD at the University of Berlin in 1894 – the first American to obtain a doctorate in Egyptology – he joined the faculty of the University of Chicago. In 1901, he became director of the Haskell Oriental Museum at the university, where he continued to concentrate on Egypt. In 1905, Breasted was promoted to full professor and held the first chair in Egyptology and Oriental History in the United States.

Breasted was a committed field researcher in Egypt and the Levant and had a productive interest in recording and interpreting ancient writings, especially from sources and structures that he feared may be lost forever. In 1919, he founded the Oriental Institute (later known as, the Institute for the Study of Ancient Cultures) at the University of Chicago, a center for interdisciplinary study of ancient civilizations. That same year, he was elected to the American Philosophical Society.

Friedrich Wilhelm Christian Karl Ferdinand von Humboldt (22 June 1767 – 8 April 1835) was a Prussian philosopher, linguist, government functionary, diplomat, and founder of the Humboldt University of Berlin. In 1949, the university was named after him and his younger brother, Alexander von Humboldt, a naturalist.

He was a linguist who made contributions to the philosophy of language, ethnolinguistics, and to the theory and practice of education. He made a major contribution to the development of liberalism by envisioning education as a means of realizing individual possibility rather than a way of drilling traditional ideas into youth to suit them for an already established occupation or social role. In particular, he was the architect of the Humboldtian education ideal, which was used from the beginning in Prussia as a model for its system of public education, as well as in the United States and Japan. He was elected as a member of the American Philosophical Society in 1822.

The Free University of Berlin (German: Freie Universität Berlin, often abbreviated as FU Berlin or simply FU) is a public research university in Berlin, Germany. It was founded in West Berlin in 1948 with American support during the early Cold War period as a Western continuation of the Friedrich Wilhelm University, or the University of Berlin, whose traditions and faculty members it retained. The Friedrich Wilhelm University, being located in East Berlin (East Germany), was renamed the Humboldt University. The Free University's name referred to West Berlin's status as part of the intellectual continuum of the Western "Free World", contrasting with Soviet-controlled East Berlin.

In 2008, as part of a joint effort, the Free University of Berlin, along with the Hertie School of Governance and WZB Social Science Research Center Berlin, created the Berlin Graduate School for Transnational Studies.

Heinrich Wölfflin (German: [ˈhaɪnʁɪç ˈvœlflɪn]; 21 June 1864 – 19 July 1945) was a Swiss art historian, esthetician and educator, whose objective classifying principles ("painterly" vs. "linear" and the like) were influential in the development of formal analysis in art history in the early 20th century. He taught at Basel, Berlin and Munich in the generation that saw German art history's rise to pre-eminence. His three most important books, still consulted, are Renaissance und Barock (1888), Die Klassische Kunst (1898, "Classic Art"), and Kunstgeschichtliche Grundbegriffe (1915, "Principles of Art History").

Wölfflin taught at Berlin University from 1901 to 1912, at Munich University from 1912 to 1924, and at University of Zurich from 1924 until his retirement.