Since Hamas fighters carried out the deadliest attack on Israel in decades, Israeli officials have vowed to crush the Palestinian militant group and its enigmatic leader in Gaza. But seven weeks into the war, 61-year-old Yehya Sinwar remains alive, in hiding and at the helm of Hamas’ fighters as they battle Israeli forces. After weeks of negotiations, Sinwar was able to claim a political victory with the announcement of plans for a temporary cease-fire and a hostage-for-prisoner exchange deal. Sinwar is rarely seen in public, disciplined and dictatorial. He is a veteran Hamas militant feared on both sides of the battle lines.