The Messianic Imperative: Reason, Law, and the Ethics of Hermann Cohen This is a collated version of parts one, two and three of my mini-series on the Jewish neo-Kantian ethicist Hermann Cohen. The Messianic Imperative: Reason, Law, and the Ethics of Hermann Cohen Hermann Cohen (1842 – 1918) was a German-Jewish philosopher, one of the founders of the Marburg School of Neo-Kantianism and an intellectual precursor to the 20th century Jewish existentialist humanism of Martin Bu