Dr. Preston F. Marshall is an Engineering Director, and Principle Wireless Architect for Google Wireless, responsible for spectrum access technology. His focus is the creation of a vibrant ecosystem of equipment, users, and standards in the newly shared 3.5 GHz Citizens Broadband Radio Service (CBRS) band. He is also chair of the Wireless Innovation Forum Spectrum Sharing Subcommittee and chair of the Board of the CBRS Alliance.