Mosab Hassan Yousef (Arabic: مصعب حسن يوسف; born May 5, 1978) is a Palestinian who worked undercover for Israel's internal security service Shin Bet from 1997 to 2007.Shin Bet considered him its most valuable source within the Hamas leadership: the information Yousef supplied prevented dozens of suicide attacks and assassinations of Israelis, exposed numerous Hamas cells, and assisted Israel in hunting down many militants, including the incarceration of his own father, a Hamas leader Sheikh Hassan Yousef. In March 2010, he published his autobiography titled Son of Hamas. Wikipedia
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