Karl-Otto Apel
Karl-Otto Apel (; 15 March 1922 – 15 May 2017) was a German philosopher and Professor Emeritus at the University of Frankfurt am Main. He developed a distinctive philosophical approach which he called "transcendental pragmatics" (Transzendentalpragmatik). He was known for his works Understanding and Explanation: A Transcendental-Pragmatic Perspective and Theory of Communicative Action.