One of this philosopher's most well known works addresses the difference between a priori and a posteriori concepts in one's understanding of the outside world. This man also 
One of this philosopher's most well known works addresses the difference between a priori and a posteriori concepts in one's understanding of the outside world. This man also analyzed aesthetic and teleological (*) judgment in a 1790 work also known as his third critique. He proposed four cases of ethical action and spelled out the categorical imperative in The Groundwork of the Metaphysics of Morals. FTP, name this German philosopher who wrote critiques of Practical and Pure Reason.
One of this philosopher's most well known works addresses the difference between a priori and a posteriori concepts in one's understanding of the outside world.
Immanuel {Kant}