About Us

Seijiro Shirahama joined 3X4Genetics K.K. as President, Japan Operations in April 2024. He brings more than 40 years of executive leadership across medical technology and biotechnology, helping expand genetics testing for healthy longevity and preventive care in Japan.

He began his career at Baxter Healthcare, building and commercializing hematology, gene therapy, and immunotherapy solutions across Japan and Asia. (1981 - 1997)

He later served on the Board of Directors at Bristol-Myers Squibb K.K. and led the ConvaTec Division. (1997 - 2002)

After BMS, he joined Cytori Therapeutics as Vice President, Asia Pacific and President of Cytori Therapeutics K.K., advancing adipose-derived stem cell technologies in regenerative medicine. Over 20+ years, he led more than $400 million in transactions and financings, including collaborations with Olympus, Astellas Pharma, Green Hospital Supply, Roche, GE Healthcare, and others. In 2019, he raised substantial capital, led an MBO of the Japan subsidiary, and listed it on the Tokyo Stock Exchange.

During his Cytori tenure, he built partnerships that supported more than two dozen clinical and pre-clinical studies across Japan with leading institutions, researchers, and clinicians. (2002 - 2023)

Yasuko Kato is a Registered Dietitian with clinical experience in hospital and institutional settings, specializing in Medical Nutrition Therapy and personalized nutrition guidance for clients in Japan. She is also a certified Intuitive Eating Counselor, integrating evidence-based nutrition with individualized lifestyle recommendations. She mentors 3X4 practitioners through clinical training and practical implementation support.

Shunsuke Yamazaki has been serving as Manager of Sales, Marketing and Business Development at 3X4Genetics K.K. since July 2025. Leveraging advanced genetic testing technologies, he is committed to promoting evidence-based lifestyle optimization to support healthy longevity and biological age management.

Professional Experience & Background

Engineering & Research (2009–2019)
After earning his Doctorate in Engineering from the University of Tokyo, Shunsuke spent a decade at Schlumberger K.K., a global leader in oilfield services. He specialized in the research and development of advanced downhole analytical instrumentation for oil and gas wells.

Business Strategy & Management
He later obtained his MBA from GLOBIS Graduate School of Management and established himself as an independent management consultant, advising organizations on strategy and growth.

Executive Leadership (2022–2025)
In 2022, he joined Glocal Marketing Co., Ltd., a consultancy supporting regional SMEs, as Director and CFO. As executive lead for listing preparation, he successfully guided the company to its listing on the Tokyo Stock Exchange (TPM) in October 2024.

Current Appointments
In addition to his role at 3X4Genetics K.K., he serves as a Lecturer at the National Institute of Technology, Nagaoka College and Niigata Management University, where he teaches Entrepreneurship.