Abdullahi Ibrahim has taught history at the University of Missouri for more than 15 years, but now he's retiring to return to his homeland, and, he hopes, to get elected as president of the African nation.
Ibrahim announced his candidacy for president last year while he was there on sabbatical. Sudan has been led nearly 20 years by a military dictator.
Ibrahim is 67, and had been a political activist in Sudan in the 1960s.
Sudan has been embroiled in civil wars since 1956. Its western Darfur region has gotten global attention because of a conflict that has included the rape, torture and displacement of hundreds of thousands of Sudanese citizens.