Intellectuals are the thinking lot who use their intelligence to demonstrate the different capacities of the human mind. They usually are involved in learning, critical analysis, researching and reasoning. They use their skills in different fields including literature, medicine, law and scientific research. Since times immemorial, the world has been home to several intellectuals and academicians who have utilized their thinking power to articulate a stream of belief which led to the development of theories. When Karl Marx suggested his theories, a school of thought was started and the era began to be known as a Marxist period of thinking. Marxism became a line of belief which is practiced till date. Much like the earlier days, every century has had its share of intellectuals and academicians who have contributed to the world knowledge through their wisdom, thinking and philosophies. In the 19th century, there were several intellectuals and academicians who changed the world with their philosophies. Great intellectuals like Alexander Bain, Alfred Adler, Alfred Russell, Wallace, Arthur Keith, Bernard Berenson and others introduced new theories, philosophies and thinking in various fields to enrich the era’s intellectual and academic history. Their endeavour towards reaching new models and theories assisted in establishing new foundations of belief. Check this section to know about some of the most famous intellectuals and academics of the 19th century.