Graduate of Tokyo University of the Arts. After working in lighting design offices in Finland and Germany, set up Motoko Ishii Lighting Design Inc. Works both in Japan and overseas as a lighting designer, pioneering in a wide genre of light-related projects such as city illumination, architectural illumination and performances using lights. Main works include the illumination of the Tokyo Tower, Rainbow Bridge, Tokyo Gate Bridge, illumination at Hakodate and Kurashiki, the traditional village at Shirakawa, "Sho-ene Akari Park", and Kabuki-za. Works abroad include the illumination of the Seine in Paris (commemorating 150 years of Japan-France relations), the Elisabeth Bridge in Budapest (marking 140 years of Japan-Hungary relations), the "Light Message for Peace" event in Berlin (celebrating 150 years of Japan-Germany relations), and a special exhibition at Maison & Objet Paris. Recipient of numerous domestic and overseas awards. Received the Purple Ribbon Medal in 2000.
Book of Ishii's works include "Motoko Light+Space+Time". Among books Ishii has written are "Lighting Horizons" "Hikari ga terasu mirai shomei design no shigoto" (The illuminated future - the job of lighting design), "LOVE THE LIGHT, LOVE THE LIFE - jiku okoeru hikari o tsukuru' (Creating lights that transcend time and space), and "Shin inei raisan" (The new praise for darkness).