Karl Marx was born in 1818, in the Rhenish city of Trier, the son of a successful lawyer. He studied law and philosophy at the universities of Bonn and Berlin, completing his doctorate in 1841. In Paris three years later, Marx was introduced to the study of political economy by a former fellow student, Frederick Engels. In 1848 they collaborated in writing The Communist Manifesto. Expelled from Prussia in the same year, Marx took up residence first in Paris and then in London where, in 1867 he published his magnum opus Capital. A co-founder of the International Workingmen's Association in 1864, Marx died in London in 1883.

A Fellow of the British Academy and the American Academy of Arts and Sciences, Eric Hobsbawm is the author of more than twenty books of history, including The Age of Revolution and The Age of Extremes. He lives in London.