Titulaire d'un DEA d'histoire moderne (Paris IV Sorbonne), où il a travaillé sur l'émergence de la diplomatie en Europe occidentale à l'époque moderne, Jean-Thomas Lesueur est délégué général de l'Institut Thomas More.
D’abord directeur des Études, il est devenu Délégué général en 2007. Ses travaux portent sur les questions politiques liées aux enjeux institutionnels et identitaires européens et l'analyse de la vie politique française.
Fondé en 2004, l'Institut Thomas More est un think tank d'opinion, européen et indépendant basé à Bruxelles et Paris. Il diffuse auprès des décideurs politiques et économiques et des médias internationaux des notes, des rapports, des recommandations et des études réalisés par les meilleurs spécialistes et organise des conférences, des rencontres et des séminaires sur ses thèmes d'études.
L'Institut Thomas More est la fois un laboratoire d'idées et de solutions innovantes et opératoires, un centre de recherches et d'expertise, un relais d'influence. Organisé en réseau, il réunit et fait travailler ensemble des personnalités politiques, des chefs d'entreprises, des experts et analystes européens. La démarche de l'Institut se fonde sur les valeurs proclamées dans sa Charte : libertés et responsabilité, dignité de la personne, subsidiarité, économie de marché, ainsi que les valeurs universelles qui sont l'héritage commun des pays européens.
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