Karl Heinrich Marx was born on May 5, 1818, in Trier, then Kingdom of Prussia, German Confederation. His father, Hershel Mordechai, was the son of a rabbi. Karl converted to Lutheran Christianity because Jews were not allowed to practice law. He graduated from the Trier Gymnasium, then studied law at the University of Bonn, where he was briefly a president of the Trier Tavern Club. He transfered to the Fridrich-Wilhelms-Universitat in Berlin, from which he graduated in 1841 with a doctorate in philosophy. He abandoned a university career and became an editor of a liberal newspaper, "Rheinische Zeitung", in Cologne. A year later the paper was shut down by the Prussian government. Marx moved to France, where he wrote "Zur Judenfrage" ("On the Jewish Question", 1843), a critique of civil rights in his time.

In Paris Marx met Friedrich Engels. Engels was the son of a wealthy capitalist and supported Marx throughout his life. Together they developed the communist ideology. Police forced him to leave Paris and he moved with Engels to Brussels. There he developed the materialist conception of history and wrote "The German Ideology" and "The Poverty of Philosophy", which was a critique of Pierre-Joseph Proudhon's socialist thought. On February 21, 1848, Marx and Engels published "The Communist Manifesto", which called for revolution instead of reforms. It described all human history as a class struggle. It was commissioned by the Communist League of German emigrants in London. Marx himself was active in London.

Police arrested Marx and expelled him from Belgium. He returned to Paris. There he managed to get the French government money to subsidize four hundred German immigrants' return tickets. In 1849 the French government collapsed and Marx returned to Cologne. There he was on two trials for his calls for armed rebellion of the poor. He was acquitted twice, but his newspaper was closed. He returned to Paris again, but was forced out. With the money from Engels he moved to London. There Marx lived for the rest of his life on financial contributions from Engels.

In London he became the central figure in a new organization called "The International Working Men's Association", which surfaced in 1864. Marx authored its first public statement in 1864, and many declarations and manifestos that followed. "Das Kapital"--his main work on economics--was drafted in three volumes. Only the first volume was completed and published in 1867. The second and third volumes remained unfinished and were published posthumously.

Marx and his wife Jenny von Westphalen had six children, three of whom died at young age. His daughter Eleanor was a socialist and assisted Marx in editing his works. She committed suicide in 1898. His other daughter, Laura, committed suicide in 1911. Karl Marx died on March 14, 1883, and was buried in Highgate Cemetery in London.