Marie studied philosophy in France, at the Ecole Normale Superieure (Fontenay St Cloud), at the Ecole des Hautes Etudes en Sciences Sociales and at the Institut Jean Nicod, where she did her PhD as well as an M.Sc. in cognitive science. She also studied fine arts at the Ecole Nationale Superieure des Arts Decoratifs (Paris). Before joining Essex, she was a research fellow at the Institut Jean Nicod, at LOGOS (Universitat de Barcelona), and at University College London.
She has published articles in journals such as Ergo, Synthese, Teorema, the Review of Philosophy and Psychology and Philosophical Explorations, mostly on self-consciousness, subjectivity, the first person in language and in thought and its pathological manifestations, and indexicals. With Manuel García-Carpintero (LOGOS), she is co-editor of a volume of essays on the "mineness" of conscious mental state and related notions, entitled Self-Experience. Essays on Inner Awareness (OUP 2023).
Another avenue of research concerns ethical and political issues associated with speech-acts. In 2021-3, Marie is working on truth, trust and dishonesty as a Fellow within the Honesty Project (Wake Forest University / Carnegie Mellon University): https://honestyproject.philosophy.wfu.edu/funding-competition-winners/.