The first time Ethan Kleinberg, the Class of 1958 Distinguished Professor of History and Letters, immersed himself in the world of the French philosopher Emmanuel Levinas 20 years ago, he wrote a book. “It was written as a traditional intellectual history and I found that what that I had done was to completely deactivate the aspects of Levinas’ thought where he believes that there are ethical guidelines that come to us from outside our own history, these transcendent ethical guidelines puncture any historical or contextual moment,” Kleinberg said. He didn’t like what he’d written, so he took an unprecedented step—he…