The crossword solution for the term 'Philosopher John' is LOCKE. John Locke was an English philosopher who lived from 1632 to 1704. He is considered one of the most influential Enlightenment thinkers and is widely known as the 'Father of Liberalism'. He is best known for his works on political philosophy, particularly his theories of natural rights and government. His writings had a major influence on the development of modern political thought.