Abraham Pais's 'Subtle is the Lord...' is the definitive biography of Albert Einstein. Timothy Ferris, in The New York Times Book Review, called it "the biography of Einstein he himself would have liked best," adding that "it is a work against which future scientific biographies will be measured." As a respected physicist himself, Pais was the first biographer to give Einstein's thinking its full due, and as a close friend and associate of Einstein,...