Léonie Alma Mason

Léonie Alma Mason is an interior architect, designer, and scenographer whose approach combines architectural rigor with artistic sensibility. Of French, Swiss, and German descent, Léonie draws on this heritage and her in-depth knowledge of art history to develop a unique vision that informs her work.

A graduate of the École Camondo, she founded her firm in 2014, a creative studio where she designs custom spaces—whether private or public—on every scale. Inspired by painting, photography—which she has been collecting for many years—and travel, she infuses her projects with a strong personality.

Léonie Alma Mason works on both new construction projects and complex renovations of residences, retail spaces, and professional environments, mastering every stage of the interior design process. Her attention to detail drives her to seek out numerous pieces of furniture and works of art throughout France and Europe to enhance projects with a distinctive identity that aligns with her clients’ expectations. To this end, she collaborates closely with French and international art galleries.

Léonie also designs numerous custom pieces that blend seamlessly into the

spaces she creates. At the intersection of interior architecture and design, Léonie Alma Mason envisions spaces that stand the test of time with elegance and character.

In 2021, Léonie Alma Mason launched her own line of furniture and lighting: LOMM Editions. Her catalog is based on the reissue of design pieces freely created in the 1970s by her grandmother, the French artist Odile Mir. Some are famous; others have remained exclusive to this day. These inventive, highly livable, and now iconic pieces are part of major public and private collections.

In September 2026, Léonie Alma Mason will open her new space in the heart of the Marais: on the first floor, her interior architecture, design, and scenography studio; on the ground floor, a “gallery” space where she brings to life exhibitions, events, and gatherings, guided by her personal favorites.