He is also a member of the Council of Foreign Relations and a four-star US Navy veteran, having formerly served as vice chairman of the Joint Chiefs of Staff, the United States' second-ranking military officer. Read More: The AI Gold Rush: How to Make Money off AI and Machine Learning! New Tethr strategic advisor Roy Chestnutt is the former executive vice president and chief strategy officer at Verizon Communications where he was responsible for development and implementation of Verizon's overall corporate strategy, including business development, joint ventures, strategic investments, acquisitions and divestitures. Chestnutt joined Verizon in 2011 from Motorola Networks where he served as corporate vice president of the Americas and helped lead the successful transition of the business unit to new ownership by Nokia Siemens Networks.