Army Lieutenant Colonel Jon S. Jackson (born 1971) is a military trial lawyer in the United States Army Reserve. He is currently representing 9/11 suspect Mustafa Ahmed Al-Hawsawi at the military commissions at Guantanamo Bay detention camp. During the arraignment of the 9/11 accused, Jackson accused the alleged mastermind of 9/11, Khalid Sheikh Mohammed of intimidating his client. Major Jackson argued for and received a separate hearing for Mr. Al-Hawsawi.