Immanual Kant was an influential Western philosopher. Like Plato and Aristotle before him, he offered many new thoughts to philosophy which continue to be important to the field today. He was German and lived from 1724-1804. His work Critique of Pure Reason was published in 1781 and was quickly recognized as a revolutionary text.
Collinson, D. & Plant, K. (2006). Fifty major philosophers. (2nd ed.). New York, NY: Routledge.