Who is Mohammed Deif and why does Israel want him dead?

For those who don't know yet why Israel is so anxious to see Mohammed Deif dead.

Deif was behind the kidnappings and murders of Israeli
soldiers Shahar Simani in April 1994 and Aryeh Frankenthal in July 1994.
In October 1994 he played a major role in running the terror cell that
kidnapped and murdered Israeli soldier Nachshon Wachsman: He handed the
orders to the cell that held Wachsman