DAI MATSUO
A entrepreneur managing multiple start-up company, he is also a leading figure in Japan’s sauna culture—a professional “SAUNNERr” who has produced a range of iconic sauna facilities across the country. Known for guiding over 1,000 guests—including executives and celebrities—into the state of totonou (a deep sauna-induced sense of clarity and relaxation in Japanese), he has earned the nickname “Totonoé-Oyakata” (Master of Totonou). Determined to make sauna culture more accessible to younger generations and a wider customers, he co-founded the creative sauna team [TTNE] with Daisuke Akiyama. Together, they established November 11 as “Totonoe Day”, officially recognized by the Japan Anniversary Association. He has also created cultural milestones such as SAUNACHELIN, an award honoring Japan’s top 11 must-visit saunas, and SAUNA37, the world’s first international award dedicated entirely to sauna culture.
In pursuit of deeper understanding and safety in sauna use, he established the Japan Sauna Academy, promoting scientific knowledge and research. As the official distributor of HARVIA, the world’s leading Finnish sauna brand, he led its successful expansion in Japan and was appointed the first-ever HARVIA Global Ambassador.
His sauna productions are known for their bold concepts and aesthetic innovation. These include the sculptural, three-dimensionally designed sauna at Kitakobushi Shiretoko resort hotel, which uses wave-like wooden forms to create a sensory experience. A collaboration with world-renowned architect and Pritzker Prize laureate Shigeru Ban on SUIDEN TERRASSE, blending modern architecture with nature and relaxation. And the Tower Eleven Onsen & Sauna at ES CON Field Hokkaido, the world’s first sauna located inside a baseball stadium, allowing guests to bathe while watching live games. Each of these projects has attracted significant attention both in Japan and internationally for redefining the potential of sauna spaces.
Today, he continues to expand Japan’s sauna culture on a global scale—redefining sauna not merely as a form of bathing, but as a lifestyle, a philosophy, and an evolving form of spatial art.
DAISUKE AKIYAMA
While leading a branding and promotional agency focused on event production, he also works globally as a professional “SAUNNER”. Since discovering the transformative power of sauna in his 20s, he has traveled the world exploring distinguished sauna traditions, and through his ongoing advocacy, has come to be known as the “Sauna-Shisho” (Sauna Master)”.
With a background in producing large-scale international events—including roles such as VVIP Director for the global music festival ULTRA JAPAN and producer for Tokyo Girls Collection, one of Japan’s largest fashion events—he brings a rare combination of strategic branding expertise and experiential design. Today, he is a pioneering force in redefining and reimagining sauna culture both in Japan and abroad.
In 2018, he co-founded the creative sauna collective team [TTNE] with Dai Matsuo. Since then, he has spearheaded numerous groundbreaking projects, including SAUNA FES JAPAN, one of Japan’s largest sauna events; the Japan Sauna Academy, which has drawn over 500 medical professionals; the country’s leading sauna ranking site SAUNACHELIN, with over 1 million annual page views; and SAUNA37, the world’s first international award solely dedicated to saunas.
His production portfolio showcases a bold fusion of design, architecture, and wellness innovation. Highlights include Solo Sauna Tune, Japan’s first fully private sauna facility; BEDROOM SAUNA at Shiraiwa Hotel, blending the intimacy of hotel suites with sauna relaxation; and SANA MANE / SAZAE in Naoshima—created in collaboration with world-renowned architect Kengo Kuma—a next-generation sauna installation that unites art, architecture, and sensory experience.
In 2025, he was appointed Executive Producer for “Taiyo no Tsubomi”, a visionary sauna installation for Expo 2025 Osaka-Kansai, offering a glimpse into the future of the sauna experience. His innovative approach and refined aesthetic continue to attract attention far beyond Japan’s borders.
His growing global impact also led to his appointment as the world’s first Global Ambassador for HARVIA, the leading Finnish sauna brand. As a cultural bridge between Japan and the world, he is widely recognized as a key figure driving the next generation of sauna culture—blending Japanese sensibility with global vision to shape a new era of sauna as lifestyle, philosophy, and art.