After graduating from Tama Art University, Eiji Yoshida worked at andesign and then belonged to CURIOSITY and studied under Gwenael Nicolas. For eight years at CURIOSITY, he participated in the store design for UNIQLO BLACK, COSMEME, LOUIS VUITTON Ginza Namiki, NISSAN MOTOR SHOW, LEXUS RX MUSEUM, Tokyo Midtown cherry blossom light-up pop-up exhibition, Nikkei Shimbun headquarters building and MORIMOTO KAWASAKI TOWER entrance hall and etc.
He established design studio BALLON in 2012. Focusing on interior design, he is active in a wide range of fields, transcending genres and expanding into Southeast Asia, in addition to Japan. In recent years he has also been involved in the development of materials, pursuing a new world of texture that has never been seen before.