Zebley was an FBI special agent working for the bureau 's Counterterrorism Division for seven years . As an FBI agent , Zebley investigated al-Qaeda 's bombings of U.S. embassies in east Africa in 1998 , and after September 11 attacks was assigned to the FBI 's PENTTBOM team , which investigated the terrorists responsible for the attacks . Zebley was one of the investigators who built the case against Zacarias Moussaoui , who was ultimately sentenced to life imprisonment . Zebley testified at Moussaoui 's trial
bombings of U.S. embassies in east Africa
1998 United States embassy bombings
Aaron Zebley