Hiroshi Ishii (石井 裕, Ishii Hiroshi, born 1956) is a Japanese computer scientist. He is a professor at the Massachusetts Institute of Technology. Ishii pioneered the Tangible User Interface in the field of Human-computer interaction with the paper "Tangible Bits: Towards Seamless Interfaces between People, Bits and Atoms",[1] co-authored with his then PhD student Brygg Ullmer.