Karl Heinrich Marx was a German philosopher, economist, sociologist, historian, journalist, and revolutionary socialist. His ideas played a significant role in the development of social science and the socialist political movement. He published various books during his lifetime, with the most notable being The Communist Manifesto
(1848) and Capital
(1867–1894); some of his works were co-written with his friend and fellow German revolutionary socialist, Friedrich Engels.
George Eastman was an American innovator and entrepreneur who founded the Eastman Kodak Company and invented roll film, helping to bring photography to the mainstream. Roll film was also the basis for the invention of motion picture film in 1888 by the world's first filmmakers Eadward Muybridge and Louis Le Prince, and a few years later by their followers Léon Bouly, Thomas Edison, the Lumière Brothers and Georges Méliès.