After working at Sony Design Center, Ashitomi established SAAT DESIGN INC. in 1991. He has been a Professor of Product Design at Tama Art University in the Department of Product and Textile Design since 2008. He is involved in comprehensive design approaches including design development of electronic products such as information technology devices and home electronic appliances, local industry development, and design education.

Born in Kanagawa in 1975, Saito began his career in New York in 2000 after graduating from Columbia University with a Master of Science degree in Advanced Architectural Design (MSAAD). He returned to Japan after being selected as an artist for Echigo-Tsumari Art Triennial 2003. After working as a free-lance designer, he established Rhizomatiks Co., Ltd. (present Abstract Engine Co., Ltd.) in 2006. Leading the internal architecture department Panoramatiks, he is working as a planning and implementation advisor on a number of projects for governments and corporations. He was the Creative Advisor of Expo 2020 Dubai Japan Pavilion and Creator of Expo 2025 People’s Living Lab.