"The committee's report found that the interrogation techniques devised by Mitchell, a retired air force psychologist, were far more brutal than disclosed at the time, and did not yield useful intelligence. These included waterboarding, stress positions, sleep deprivation for days at a time, confinement in a box and being slammed into walls. But Mitchell, who was reported to have personally waterboarded accused 9/11 mastermind Khalid Sheikh Mohammed, remains unrepentant." (thanks Amir)