Nickolay Mladenov, the man chosen to serve as the director-general for U.S. President Donald Trump’s Board of Peace in Gaza, is a Bulgarian politician and former U.N. envoy to the Middle East who frequently has worked to ease tensions between Israel and Hamas. His appointment — announced by Israeli Prime Minister Benjamin Netanyahu on Thursday and confirmed by a U.S. official — makes him the top official in an unproven international body tasked with governing the Gaza Strip under the next phase of a fragile U.S.-brokered ceasefire after two years of war.