Mathilde Favier, the longtime Dior public relations executive, was known for keeping a relatively private personal life despite working at the center of Parisian fashion and regularly appearing alongside some of the industry’s biggest names.
Her relationship with French film producer Nicolas Altmayer was one of the more visible parts of her life outside Dior. The couple were together for several years and had built a home and social life in Paris before their lives were tragically cut short in a road accident in western France on August 17, 2026. Favier was 57, while Altmayer was 61.
Nicolas Altmayer
Nicolas Altmayer was an established French film producer whose career was closely connected with the country’s commercial and independent cinema.
He was associated with Mandarin & Compagnie and worked on numerous productions, including films from the popular OSS 117 series. His producing career also included Monsieur Aznavour, adding to a body of work that made him a familiar name within French cinema.
Unlike Favier, whose professional world centered on luxury fashion, Altmayer spent his career behind the scenes in film. Their relationship therefore brought together two influential circles in Paris: haute couture and French cinema.
Their Relationship
Favier and Altmayer were partners for several years and had been planning a new chapter of their life together.
Christie’s previously reported that Favier had moved to a new home around the time she began a new chapter with Altmayer, whom she described as the man with whom she wanted to spend the rest of her life. The couple also appeared together publicly at Paris cultural and charity events.
Their relationship was not merely a social connection. Official French corporate records show that Favier and Altmayer established a property company together in Paris in 2025, with both listed as managers and associates. The documents identify them as having entered into a civil solidarity pact, or PACS, in January 2025.
That detail is important because some online reports have described Altmayer simply as Favier’s “husband.” Public records, however, indicate that the couple were legally partnered through a PACS rather than married to each other.
Her Earlier Marriages
Before her relationship with Altmayer, Favier had been married twice.
French corporate records identify Robert Agostinelli as her first husband. Their marriage ended in divorce in 2009. Favier and Agostinelli had two children together, Héloïse and Carlo.
Favier later married Antoine Philippe Meyer. That marriage also ended in divorce, with the relevant French court judgment dated January 2013. The same official record states that Favier was not remarried after that marriage.
This makes the description of Altmayer as her “third husband” potentially misleading. Available public records show that he was her long-term partner and PACS partner, rather than her legally married husband.
Her Children
Favier was a mother of two.
Her children, Héloïse and Carlo, were from her marriage to financier Robert Agostinelli. By the time Favier became established as one of Dior’s best-known public relations figures, both children were largely living away from the spotlight.
Favier had previously spoken about being an empty nester, while continuing to maintain a close connection with her family and Parisian circle.
Dior Career
Favier’s professional reputation extended well beyond her job title.
She joined Dior in 2011 and eventually became the fashion house’s director of public relations, working closely with celebrities, designers, executives and Dior ambassadors. Before Dior, she had worked in fashion journalism and public relations, including a period at Prada.
Her influence came partly from her extraordinary network. Favier was frequently described as one of the most connected figures in Paris fashion, helping coordinate relationships between Dior and prominent personalities from entertainment, culture and fashion.
Dior executives and colleagues paid tribute to her following her death. Delphine Arnault remembered her as an exceptional and passionate woman, while creative director Jonathan Anderson highlighted her warmth, energy and elegance.
Her Paris Life
Favier’s personal taste was almost as recognizable as her professional reputation.
She was passionate about interiors, art, fashion and Parisian culture. Her home and collection became the subject of extensive coverage, including a Christie’s project centered around objects associated with her life and circle of friends.
She also published a book celebrating Paris, reflecting her longstanding connection to the city’s architecture, interiors and creative community.
The Final Journey
Favier and Altmayer died together on August 17, 2026, after their vehicle collided with a heavy goods vehicle in western France while overtaking another vehicle.
French authorities opened an investigation into the circumstances of the crash. The deaths have since prompted an outpouring of grief from both the fashion and film industries.
Their deaths brought together two very different professional legacies. Favier had spent more than a decade helping shape Dior’s public image, while Altmayer had contributed to some of France’s best-known film productions.
So, who was Mathilde Favier’s husband?
The most accurate answer is that Nicolas Altmayer was her longtime partner and legal PACS partner, not her husband in the conventional legal sense. Favier had previously been married to Robert Agostinelli, with whom she had two children, and later to Antoine Meyer. Official records show that she and Altmayer entered a PACS in January 2025.
Together, Favier and Altmayer were building a new life when their sudden deaths in August 2026 brought that chapter to a heartbreaking end.
