Judah Loew, better known as the Maharal of Prague, was a pivotal personality in late medieval European Judaism. Best known from the popular legend that credited him with the creation of a golem-an artificial human with superhuman powers-his true importance lay in his comprehensive exposition of a unique expression of Jewish mystical theology, his call for a reformation of Jewish communal life, and his influence on subsequent Jewish life and thought. Byron Sherwin's lucid exposition of the life, legend, works, and ideas developed in Loew's massive writings 'reveals the concealed' by...