Favier grew up surrounded by the Paris fashion scene. Her family had deep creative roots in the city. She started her professional journey in her early twenties during the 1980s.
She did not start at the top. She worked her way up through the industry alongside her sister, Victoire de Castellane. They worked at Chanel with their uncle Gilles Dufour. Dufour was a highly respected figure and a right-hand man to Karl Lagerfeld. This early exposure gave Favier a deep understanding of how luxury fashion houses operate behind the scenes.
Later in her career, she spent time working in fashion media at Glamour magazine. This media experience helped her understand exactly what journalists and photographers wanted to see.
13 Years as Dior Couture’s PR Director
In 2011, Favier left a position at Prada to join Dior Couture as their PR Director. She held this position until her passing in 2026.
Her main job was to manage the brand’s relationships with celebrities, actors, and global ambassadors. She was excellent at this role.
Here are 3 ways she influenced the fashion industry:
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Building Global Bridges: She helped connect traditional Parisian fashion with international stars. She notably worked closely with modern celebrities like Blackpink’s Jisoo and actress Anya Taylor-Joy.
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Event Coordination: She personally escorted major stars through chaotic red carpets and runway shows, ensuring they felt safe and looked perfect for the cameras.
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Brand Positioning: She helped Dior maintain its high-end luxury status while adapting to modern internet culture and influencer marketing.
Her Book: Living Beautifully in Paris
Favier was not just a fashion executive. She was also a talented author. In the spring of 2024, she released a popular book published by Flammarion.
The book is called “Living Beautifully in Paris” in English, and “Mathilde à Paris” in French.
In the book, she acts as a personal guide to the city. She takes readers inside the private homes, studios, and kitchens of her famous friends. The book features interviews and original photography. You can find more details about her publishing work through Penguin Random House.
Mathilde Favier’s Family and Personal Life
While Favier lived a very public professional life, she tried to keep her personal relationships out of the media spotlight. However, because of her high-profile connections, certain details of her family life became public.
| Relationship | Name | Background Information |
| Former Husband | Robert Agostinelli | An Italian American financier and co-founder of the private equity firm Rhone Group. |
| Former Husband | Olivier Meyer | Favier was previously married to Meyer, though very few public details exist about their time together. |
| Son | Carlo Agostinelli | Her son with Robert. Carlo is frequently seen in high society coverage and has been linked to British tennis star Emma Raducanu. |
| Daughter | Héloïse Agostinelli | Her daughter with Robert. |
| Longtime Partner | Nicolas Altmayer | A French film producer. He was Favier’s partner at the time of her death. |
A Common Mistake About Fashion PR
Many people outside the fashion industry think a PR Director just takes photos at parties. This is a massive misunderstanding.
The reality of fashion PR requires intense strategy. A PR Director manages multi-million dollar budgets, negotiates complex contracts with talent agencies, and controls a luxury brand’s global reputation. Favier was highly respected because she handled intense corporate pressure while always maintaining a calm and welcoming personality.
A Tragic Loss in August 2026
On August 17, 2026, the fashion world received terrible news. Mathilde Favier and her partner, 61-year-old film producer Nicolas Altmayer, died in a fatal car accident.
Reports indicate their vehicle collided with a heavy goods truck in western France. Her sudden death at age 57 shocked the industry. Designers, models, and executives around the world immediately shared their sadness over the loss of Paris’s most connected and welcoming executive.
Conclusion
Mathilde Favier was a true force in the fashion world. From her early days at Chanel to her 13-year run at Dior Couture, she helped shape how the public sees luxury fashion. Her 2024 book will remain a beautiful guide to the city she loved.
If you want to learn more about the fashion industry, try these next steps:
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Look up her book “Living Beautifully in Paris” to see her personal design tastes.
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Read our guide on how luxury fashion houses manage public relations.
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Check out the latest updates from Paris Fashion Week to see how her influence lives on.
FAQs
Who was Mathilde Favier?
Mathilde Favier was a French fashion executive. She was best known as the Public Relations Director for Dior Couture, a position she held from 2011 until 2026.
How did Mathilde Favier die?
She passed away on August 17, 2026, in a fatal car crash in western France. Her partner, Nicolas Altmayer, also died in the accident.
Who are Mathilde Favier’s children?
She had two children, Héloïse and Carlo, with her former husband, the American financier Robert Agostinelli.
Did Mathilde Favier write a book?
Yes. In 2024, she published “Living Beautifully in Paris.” The book offers an exclusive look inside the homes and lives of Paris’s top creative figures.
Who was Mathilde Favier married to?
She was previously married to Robert Agostinelli and Olivier Meyer. At the time of her passing, she was in a long-term relationship with French film producer Nicolas Altmayer.
