David Coleman Headley, formerly known as Daood Sayed Gilani, (born June 30, 1960) is a Chicago-based Pakistani American, who conspired with Lashkar-e-Taiba and Pakistani ex-military officers to launch the 2008 Mumbai attacks and other terrorist activity.He changed his Muslim name to a Judaeo-Christian name to hide his Muslim identity to make travel to India easier.

Since his arrest in October 2009, Headley has been cooperating with the U.S. authorities and has yielded much information about the Mumbai attacks, as well as intelligence about ongoing terrorist activities]