The mission has overseen negotiations between clashing sides in South Ossetia since 1992, and it now has a staff of 200, including 28 trained military monitors.
His departure is a blow for the new administration's health policy; Mr Daschle, a former senator, was to have overseen negotiations with Congress over reforming the health system.
Seyoum Mesfin, a negotiator for the Intergovernmental Authority on Development (IGAD), a regional trade bloc that has overseen negotiations in South Sudan, told reporters that a "complete cessation of hostilities in South Sudan is expected as of" Monday morning.
Mr. Speyer's son, Rob, who is also in Milan, had overseen the negotiations, clashing with city and state officials before ultimately withdrawing from the deal, the official said.
Though Cruden said the BP negotiations were similar to others he had overseen, the amount of money at stake was unprecedented.
He died during negotiations over the Treaty of Jassy, which ended a war with the Ottoman Empire that he had overseen.
Mr. Allison had overseen the $700 billion Troubled Asset Relief Program.
Mr Hague's department, the Foreign and Commonwealth Office, has overseen the negotiations to date with Ecuador in the matter of Mr Assange's asylum bid.
Since he became prime minister in 2013, Gunnlaugsson has overseen sensitive negotiations with the creditors of the three big Icelandic banks that collapsed during the 2008 crisis – while knowing, the leaked documents show, that his wife's offshore company, Wintris Inc, which lost 515m kronur (£2.8m) in the crash, was owed a sizeable sum from their bankruptcies.
The fund has sent one its most senior staff members, Poul Thomsen, who has overseen complex fund negotiations in Iceland and Russia, to assist Bob Traa, the official responsible for Greece, to work out a solution.
