Karl Marx[note 1] (/mɑrks/; German pronunciation: [ˈkaɐ̯l ˈmaɐ̯ks]; 5 May 1818 – 14 March 1883) was a German philosopher, economist, sociologist, journalist, and revolutionary socialist. Marx's work in economics laid the basis for much of the current understanding of labour and its relation to capital, and subsequent economic thought. He published numerous books during his lifetime, the most notable being The Communist Manifesto (1848) and Das Kapital (1867–1894). Born into a wealthy middle-class family in Trier in the Prussian Rhineland, Marx studied at the Universities of Bonn and Berlin where he became interested in the philosophical ideas of the Young Hegelians. After his studies he wrote for Rheinische Zeitung, a radical newspaper in Cologne, and began to work out the theory of the materialist conception of history. Early life Childhood and early education: 1818–1835 Karl Marx was born on 5 May 1818 to Heinrich Marx and Henrietta Pressburg (1788-1863).