"You always saw the world as your workplace." In 2009, this was how Reinhard Mohn--the man who turned Bertelsmann AG from an unremarkable, postwar German business into a successful, international media conglomerate--described the professional dedication of his wife, Liz Mohn. Born into a seemingly hopeless world, this girl from Wiedenbr ck, Germany, grew into a proactive woman who, following her late husband's death, now represents the...