By Abigail O’Leary Haiti Prime Minister Ariel Henry has resigned amid ongoing violence in the Caribbean nation. The 74-year-old neurosurgeon who trained and worked in southern France got involved in Haitian politics in the early 2000s, when he became leader of a movement that opposed then-President Jean-Bertrand Aristide. After Aristide was ousted, Henry became member of a U.S.-backed council that helped choose the transitional government. In June 2006, he was named director-general of Haiti’s Ministry of Health and later became its chief of staff, helping to manage the government’s response t…