Friedrich Engels ( ENG-gəlz; German: [ˈfʁiːdʁɪç ˈʔɛŋl̩s]; 28 November 1820 – 5 August 1895; in English also spelled as "Frederick Engels") was a German philosopher, political theorist, historian, journalist, and revolutionary socialist. He was also a businessman and Karl Marx's lifelong friend and closest collaborator, serving as a leading authority on Marxism. Engels, the son of a wealthy textile manufacturer, met Marx in 1844.
https://en.wikipedia.org/wiki/Friedrich_Engels