Final answer:
The 'he' in the question refers to Karl Marx, who, alongside Friedrich Engels, coauthored the influential Communist Manifesto in 1848.
Step-by-step explanation:
The individual you are asking about is Karl Marx, a German philosopher and economist who developed influential theories on society and economics. During his time in Paris, he met Friedrich Engels, and they formed a significantly productive partnership. Together, they coauthored the Communist Manifesto in 1848, which has become one of the most impactful political documents globally. It outlines Marx's ideas of societal structure and the economy in the face of growing industrialization in Europe and North America, which was shifting economic focus from the farm to the factory.