| Hector Guimard - Architect | Designer of the hotel, major figure of Art Nouveau. |
| Paul Mezzara - Sponsor and industrial | Initial owner, specialist in textiles and laces. |
| Fabien Choné - Promoter of the museum project | Winner of the lease in 2025 with Cercle Guimard. |
| Léon Jallot - Artist decorator | Collaborator for interior design. |
| Edgar Brandt - Artist decorator | Contributor to decorative elements. |