Dean martin, ricky nelson,walter brennan and john wayne in online - John owen brennan (born september 22, 1955) is an american intelligence official who served as the director of the central intelligence agency (cia) from march 2013 to january 2017. he served as chief counterterrorism advisor to u.s. president barack obama, with the title deputy national security advisor for homeland security and counterterrorism, and assistant to the president....