When Hans Jonas died in 1993, he was revered among American scholars specializing in European philosophy, but his thought had not yet made great inroads among a wider public. In Germany, conversely, during the 1980s, when Jonas himself was an octogenarian, he became a veritable intellectual celebrity, owing to the runaway success of his 1979 book The Imperative of Responsibility. In the 1920s, Jonas studied philosophy with Edmund Husserl...