Jean-Sylvestre Mongrenier est docteur en géopolitique, professeur agrégé d'Histoire-Géographie, et chercheur à l'Institut Français de Géopolitique (Université Paris VIII Vincennes-Saint-Denis).
Ancien auditeur de l'Ihedn (Institut des hautes études de la Défense nationale, Paris), où il a reçu le Prix Scientifique 2007 pour sa thèse sur Les enjeux géopolitiques du projet français de défense européenne, il est aussi officier de réserve de la Marine nationale, rattaché au Centre d’enseignement supérieur de la Marine (CESM), à l’École Militaire. Il collabore régulièrement à la revue Hérodote, ainsi qu’au mensuel Afrique Magazine. Jean-Sylvestre Mongrenier a co-écrit, avec Françoise Thom, Géopolitique de la Russie (Puf, 2016).
Il est membre de l'Institut Thomas More.
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