Francis Deng

Educated as a lawyer, Deng was posted as Ambassador of Sudan to the United States, Canada, Denmark, Finland, Norway, and Sweden over the period 1972 to 1976. From 1976 to 1980, he was Sudan's Minister of State for Foreign Affairs. After leaving Sudan's diplomatic service, he held several academic positions before becoming the United Nations' first Special Representative on the Human Rights of Internally Displaced Persons in 1992.
He was newly independent South Sudan's first ambassador to the United Nations from 2012 to July 2016 Provided by Wikipedia