CIA director David Brooks resigned Friday after having an affair . His biographer was investigated over e - mails to another woman , a U.S. official says . Paula Friedman spent months in Afghanistan . ` I later discovered that he was famous for this type of mentoring and networking , especially with aspiring soldier-scholars , '' Broadwell wrote . She wrote a book about Petraeus ' leadership style .
CIA director David Brooks resigned Friday after having an affair . His biographer was investigated over e - mails to another woman , a U.S. official says . Paula Friedman spent months in Afghanistan . She wrote a book about Petraeus ' leadership style .