In 1992, she recounted her experience in "La mort intime" (Intimate death), with a preface by François Mitterrand. She was a pioneer for end-of-life support at France’s first palliative care unit, and has never stopped campaigning to raise awareness on palliative care. Marie de Hennezel works closely with the Korian Foundation for Ageing Well on supporting people in care facilities at the end of their lives, and on people’s relationship with ageing well.
A clinical psychologist since 1975, and a psychotherapist, Marie de Hennezel has also taken a university course in psychanalysis, and has studied haptonomy and analytical psychology in the field, with experts. In 1992, she teamed up with Jean-Louis Terrangle to create the Association Bernard Dutant – Sida et Ressourcement – a non-profit organisation to support HIV-positive people. She is actively committed to improving end-of-life conditions through her involvement with government initiatives and conferences, and has written many books on the matter.
- "Croire aux forces de l'esprit, éditions Fayard", 2016 et Pocket 2018
- "L'âge, le désir et l'amour", éditions Pocket 2016
- "Sex and sixty : un avenir pour l'intimité amoureuse", éditions Robert Laffont 2015