The year 1844 saw the beginning of Marx's friendship and collaboration with Friedrich Engels, whom he had already met briefly in Cologne. Engels had been through a similar spiritual evolution to Marx, though their early education was different. Born on 28 November 1820, Engels was the son of a manufacturer at Barmen (Wuppertal, near Düsseldorf). He grew up in a stifling atmosphere of narrow-minded pietism, but soon escaped from its influence, leaving school before his final year to work in his father's factory; in 1838 he was sent to Bremen to gain business experience. As a result of practical contact with trade and industry he soon became interested in social questions.
Main Currents Of Marxism (1978) - Three Volume edition - Volume I, The Founders