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Yahya Abdal-Tif Ayyash (???? ????; February 22, 1966 - January 5, 1996) was the chief bombmaker of Hamas and the leader of the Samaria battalion of the Izz ad-Din al-Qassam Brigades. In that capacity, he earned the nickname the Engineer (Arabic: ???????, transliterated Al-Muhandis).
Ayyash is credited with advancing the technique of suicide bombing in the Israeli-Palestinian conflict. The bombings he orchestrated caused the deaths approximately 90 Israelis, many of them civilians. A master of disguise, Ayyash was the most wanted man in Israel for three years, and the target of a massive man-hunt. To Palestinians, he was a celebrated hero. Ayyash was selectively assassinated by the Israeli Shabak in 1996. Shabak tricked a friend of Ayyash's into giving him a bomb-laden cell phone. When Ayyash used it, Shabak detonated it, killing him instantly.
The complete, up-to-date and editable article about Yahya Ayyash can be found at Wikipedia: Yahya Ayyash