Friedrich Engels (German pronunciation: [ˈfʁiːdʁɪç ˈɛŋəls]; 28 November 1820 – 5 August 1895) wis a German industrialist, social scientist, author, poleetical theorist, philosopher, an the co-foonder o Marxist theory, alangside Karl Marx. In 1845 he published The Condition of the Working Class in England, based on personal observations an research. In 1848 he co-authored The Communist Manifesto wi Karl Marx, an later he supportit Marx financially tae dae research an write Das Kapital. Efter Marx's daith Engels editit the seicont an third volumes. Additionally, Engels organizit Marx's notes on the "Theories of Surplus Value" an this wis later published as the "fowert volume" o Caipital.