Mosab Hassan Yousef is an American author and former Palestinian militant who defected to Israel in 1997, subsequently working as an Israeli spy for the Shin Bet until 2007. He is the son of Hassan Yousef, a co-founder of the Palestinian Islamist organization Hamas. A New York Times bestselling author, he published his autobiography, "Son of Hamas," in March 2010 and is known for his outspoken criticisms of Hamas, the pro-Palestinian movement, and Islam's treatment of non-Muslims.