Marc Smith obtained his archivist palaeographer degree as major (valedictorian) of the 1988 class of the École Nationale des Chartes with a thesis entitled La France et sa civilisation vues par les Italiens au XVIe,[2] then started his career as curator at the Archives nationales (1988–1994).
[3] In 2013, he was also elected director of studies at the Ecole Pratique des Hautes Etudes, section of Historical and Philological Sciences (chair of Palaeography and history of writing in Latin characters).
He is president of the International Committee for Latin Palaeography (2015-2020),[5] member of the Hebrew paleography Committee, former secretary (2002-2011) and former president (2014) of the Société de l'histoire de France, co-editor of the series Monumenta Palaeographica Medii Aevi (Brepols ; with Jean-Pierre Mahé and Élisabeth Lalou),[6] member of the editorial boards of Scriptorium, Gazette du livre médiéval,[7] and the Ménestrel portal,[8] member of the reading committee of Scrineum Rivista, and former editor of the Bibliothèque de l'École des chartes journal.
His research mainly concern the evolution of the Latin alphabet in its long term linguistic, technical, cognitive and cultural situations, from Roman inscriptions to digital typography.
He contributed to the expertise of many manuscripts and other objects listed in public and private collections, and the restoration of the château du Bois-Orcan in Noyal-sur-Vilaine (registration of the chapel, 2008).