Khalid Sheikh Mohammed

Khalid Sheikh Mohammed (sometimes also spelled Khalid Shaikh Mohammed; among at least fifty pseudonyms; born March 1, 1964; or April 14, 1965) is a Pakistani terrorist. He held by the United States at the Guantanamo Bay detention camp under terrorism-related charges. He is seen as the person who planned the 9/11 attacks in the "9/11 Commission Report".
Sheikh Mohammed was a member of Osama bin Laden's al-Qaeda organization, leading al-Qaeda's propaganda operations from around 1999 until late 2001. 
He confessed to FBI agents to a role in many of the most significant terrorist plots over the last twenty years.
Mohammed's trial (started again or) restarted on 7 September 2021.