Karl Marx, the philosopher, economist, political theorist and socialist revolutionary, is best-known for the 1848 pamphlet, The Communist Manifesto and the three-volume Das Kapital. His theories, called Marxism, maintained that class conflict leads to the development of human societies and that internal tension were inherent in capitalism, which would ultimately be replaced by the socialist mode of production.
One of the few personalities known for his disdain of self-promotion, Thomas Sowell is an important American social theorist and economist. Over the years, he has played a prominent role working as a faculty member of many prestigious universities, such as the University of California, Los Angeles (UCLA) and Cornell University.
The 13th Prime Minister of India, Manmohan Singh became the first Sikh in office when he took office in 2004. A prominent economist and academic, he held several key posts in the Government of India in the 1970s and 1980s. Known for his humility, he has been described by the media as "one of the world's most revered leaders."