Amid Sudan's Unrest, Ambassador Sees Chance For New Nation By NPR Staff Published June 21, 2011 at 12:00 PM EDT Facebook Twitter LinkedIn Email Listen • 1:15 Evan Vucci / ASSOCIATED PRESSAmbassador Princeton Lyman at the announcement of his appointment as the new U.S. Special Envoy for Sudan, March 31, 2011, at the State Department in Washington. Copyright 2011 NPR