He founded Pacific Communications Research Corp. focusing on ASIC, SW and system design for PCS In 1995, at the same time he served as Senior Executive Vice President, President of Uniden Corporation. From January 1999 to July 2001, he served as Executive Vice President, Mitsubishi Wireless Communications Inc (MWCI) in USA, as well as President, Mobile Communications Technology Center of MWCI in San Diego, CA responsible for mobile phone technology development up to real/sellable and high yield products with all certificates (FCC, CTIA and inter-operability). From 2002 to 2005, he served as Executive Vice President of Teradyne Japan responsible for P/L, Engineering, Production and Global Marketing as well as President and CEO of Omni Wireless Inc., in California, USA. He is currently Program Director, Ubiquitous Mobile Communications at NICT (National Institute of Information and Communications Technology) of Japan as well as President of Pacific Star Communications, Inc., a Visiting Professor, Research Institute of Electrical Communications, Tohoku University, Japan, and an Affiliate Faculty Member, Electrical Engineering, University of Hawaii, USA. He has published over 190 technical papers, held over 75 patents (including a patent which became DOD (Department of Defense, USA) standard in 1998), co-founded International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC). He is a Fellow of the IEEE and IEICE and served as an Editor of IEEE Transaction on Communications, Chairman of Satellite and Space Communications Committee, COMSOC IEEE, a Board Member of IEICE Japan.