The article provides a reminiscence of Karl Deutsch as a teacher and scholar. I examine his scholarship and focus on its enduring qualities. In particular, I highlight how he was a passionate advocate of innovative approaches to enduring political problems. His comprehensive theoretical vision, with central concepts such as communication and learning, remains as inspiring as his methodological eclecticism. It offers a synthesis of traditional sociology of the Europe he had left behind with the rationalist empiricism that he encountered in America.