Preston MarshallPreston Marshall led the Google and Alphabet Inc. efforts to establish the technical, commercial, and regulatory ecosystem to make three-tier spectrum a success in the USA. He was a major participant in the USA PCAST study that was the basis of the tree-tier concept. He chairs the Wireless Innovation Forum Spectrum Sharing Committee, and is founding vice chair of the CBRS Alliance. Previously he was Deputy Director of the Information Sciences Institute (ISI) at the University of Southern California (USC), Research Professor at USC's Electrical Engineering Department, and Program Manager for wireless, cognitive radio, and networking programs at the US Defense Advanced Research Projects Agency (DARPA). Read More Read Less