U.S. officials with knowledge of David Petraeus' decision to resign as CIA director over an extramarital affair identify the woman involved as his biographer, Paula Broadwell.
Broadwell is a West Point graduate and an Army reservist who was recalled three times to active duty after the Sept. 11 attacks to work on counterterrorism issues. She specialized in military intelligence before pursuing an academic career,
In the preface to "All In: The Education of General David Petraeus," Broadwell wrote that Petraeus became a mentor after they met at Harvard's Kennedy School of Government in 2006.
The book began as research for her dissertation, a case study of Petraeus' leadership. It evolved into an authorized biography written with Washington Post editor Vernon Loeb after President Barack Obama put Petraeus in charge of Afghanistan in 2010.
With the book done, Broadwell told friends she was returning to her dissertation, using part of her research on Petraeus to complete her doctorate.
Officials say the FBI discovered the relationship while checking reports that Broadwell may have had access to Petraeus' personal email.