Immanuel Kant (1724-1804) was a German philosopher, who is considered the most influential thinker of the Enlightenment era and one of the greatest Western philosophers of all times. His works, especially those on epistemology (theory of knowledge), aesthetics and ethics had a profound influence on later philosophers, including contemporary ones.
The below video will tell you more about Immanuel Kant and his philosophy:
Critique of Pure Reason
Groundwork of the Metaphysics of Morals
Critique of the Power of Judgement
Religion Within the Boundaries of Mere Reason