He attended the Collège Saint -Martial in Port-au-Prince, where he was a member of the Christian Student Youth Group (JEC).
In 1979, he returned to Haiti, working at the Institute Pédagogique National (IPN) in Port-au-Prince, focusing on educational research and teacher training.
He worked with the Groupe d'Appui aux Rapatriés et Réfugiés (GARR) in defense of Haitians in the Dominican Republic and the Mouvement d'Action Démocratique (MAD).
Among the issues that concerned him was a 2013 Dominican court ruling that removed citizenship rights to the children of undocumented foreigners.
Former Haitian Prime Minister Jean-Max Bellerive called Alexandre "a true democrat always looking for a pragmatic way to use his empirical studies or his authority to improve the daily reality of Haitians.”[1]