Mohammed Deif, born in Gaza in 1965, is a founding member and commander of Hamas‘s Izz al-Din al-Qassam Brigades (IQB). He became head of the IQB in July 2002 after Israel assassinated its former leader Saleh Shehada.
Deif has survived multiple Israeli assassination attempts, two of which left him seriously injured. While recovering from his injuries, Deif was replaced as IQB head by Ahmad Jabari, who was assassinated by Israel in November 2012. During the 2014 war, an attempted assassination by Israel killed his wife and one of his children, and injured other family members.
Deif is listed as a Specially Designated Global Terrorist (SDGT) by the US Department of State.