Born in Porto Novo and educated abroad, Holo taught at the Ecole Nationale d'Administration from 1979 to 1985. He accepted a professorship in international relations and constitutional law at the Université Nationale du Bénin in 1986. He simultaneously served as deputy director of the Ecole Nationale d'Administration and became the director in 1989. The following year, Holo was appointed deputy secretary;general of the Haut Conseil de la Republique du Benin, supervising multiparty elections in 1991. After being foreign minister, he was justice and international relations minister and spokesman for Nicephore Soglo's government. He returned to teaching in 1996 and earned the UNESCO Human Rights and Democracy chair of the Université d'Abomey-Calavi. Holo joined the Benin Constitutional Court on 7 June 2008 and became the chairman of the Haute Cour de Justice on 24 June 2009.
- Houngnikpo, Mathurin; Decalo, Samuel (2013). Historical Dictionary of Benin. Rowman & Littlefield. ISBN 0810871718.
| Foreign Minister of Benin