He was Israel's most valuable spy inside Hamas – and certainly the most unlikely.
For more than a decade, Mosab Hassan Yousef disrupted dozens of suicide bombings and assassination attempts by the militant group, saving hundreds of lives.
Infiltrating the upper echelons of Hamas came relatively easy for Yousef: He is the son of Hamas founder Sheikh Hassan Yousef.
“So many people owe him their life and don't even know it,” an Israeli security agent told the Israeli daily Haaretz on Wednesday.
“People who did a lot less were awarded the Israel Security Prize. He certainly deserves it.”
Yousef's astonishing career as a spy is chronicled in his soon-to-be released memoir, “Son of Hamas.”
Yousef, 32, was recruited by the Shin Bet, Israel's internal security agency, in 1996 after he was arrested.
Inside Israel's intelligence community, he became known as the Green Prince – a nod to the color of Hamas' flag and his pedigree as the son of one of its founders.
Yousef's exploits are the stuff of legend.
He once picked out a suicide bomber in a crowded square after the Shin Bet received a vague tip.
About 10 years ago, in the Palestinian uprising known as the Second Intifadeh, Yousef supplied intelligence that led to the arrests of several key Palestinian leaders.