Atsushi Shionozaki received his PhD in Computer Science from Keio University in 1995. He joined Sony Computer Science Laboratories, Inc. (Sony CSL) in Tokyo focusing on Internet protocol research. In 2000, he joined Stanford Networking Research Center as a reseacher in residence representing Sony. After returning to Sony CSL in Tokyo in 2004, he started working on the wireless LAN locationware platform PlaceEngine with other lab members. Since then, he has left Sony CSL to start Koozyt, Inc. to market PlaceEngine business world and spawn off other location based technologies. He is a founding member and CTO of Koozyt, Inc.