- Khalid Sheikh Mohammed (sometimes also spelled Shaykh; also known by at least 50 pseudonyms; born 14 April 1965), often known by his initials KSM, is a Pakistani terrorist, mechanical engineer and the former Head of Propaganda for al-Qaeda. He is currently held by the United States at the Guantanamo Bay detention camp under terrorism-related charges. He was named as “the principal architect of the 9/11 attacks” in the 2004 9/11 Commission Report.[