Pierre Henriet is a French MP affiliated with Horizons (HOR), trained as a mathematician and epistemologist. He co-organized the June 29, 2026 National Assembly UAP symposium with arnaud-saint-martin (LFI) (src-france-national-assembly-uap-conference-2026-05), saying: “Il fallait poser ce dossier dans une enceinte de la représentation nationale pour le traiter posément” [This issue needed to be placed before a chamber of national representation so it could be addressed calmly].
Discrepancy note: the May 2026 preview sources describe Henriet as OPECST’s current vice president / First Vice-President. The June 30, 2026 franceinfo recap (src-france-assembly-uap-colloquium-recap-2026-06) instead describes him as OPECST’s former president (2022–2023). Not yet reconciled — flagging both claims pending a tie-breaking source.