Ramanuja was a theologian, philosopher, and scriptural exegete. Aristotle was an ancient Greek philosopher and scientist. Aristotle was perhaps the first truly systematic philosopher and scientist. Ludwig Feuerbach was a German philosopher and anthropologist. Kantian ethics refers to a deontological ethical theory developed by the German philosopher Immanuel Kant. Learning by doing refers to a theory of education expounded by American philosopher John Dewey. He was an Italian philosopher and writer, and a member of the Assassin Order. Cuban is an admirer of author and philosopher Ayn Rand. The commission was headed by the noted American philosopher and educator John Dewey. Horst Matthai Quelle was a Spanish language German anarchist philosopher influenced by Max Stirner. Many of his contemporaries, including German philosopher Heinrich Olbers, disagreed. The most famous contemporary Aristotelian philosopher is Alasdair MacIntyre. It was the birthplace of the sceptical philosopher Favorinus. The Greek philosopher Socrates' emerged an ideal. Heidegger has been very influential on the work of the Italian philosopher Giorgio Agamben.