Gershom Scholem (1897-1982) was ostensibly a scholar of Jewish mysticism, yet he occupies a powerful role in today's intellectual imagination, having influential contact with an extraordinary cast of thinkers, including Hans Jonas, Martin Buber, Walter Benjamin, Hannah Arendt, and Theodor Adorno. In this first biography of Scholem, Amir Engel shows how Scholem grew from a scholar of an esoteric discipline to a thinker wrestling with problems that...