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Management Team

Greg Marzullo


(President and CEO)

Greg Marzullo has been our President and Chief Executive Officer and a director since September 2014. Greg has over 25 years of experience developing and leading go-to-market initiatives in the Americas, Asia-Pacific, and EMEA regions for both start-up and large multinational organizations. Greg has led global sales efforts focusing on point to multipoint, WiMAX, free space optics, and line of sight and non-line of site microwave communications. Before joining Proxim, Greg was Senior Vice President of Worldwide Sales at Exalt Communications. He also spent four years at Navini Networks as EVP global sales, where he grew annual orders and revenues at an 80% CAGR, leading to its acquisition by Cisco Systems in 2007. Greg held several executive positions in sales and marketing during a 10-year career at Nortel Networks. He began his career in operations and marketing at Bell Atlantic. Greg holds a Master of Business Administration from the Fuqua School of Business at Duke University and a Bachelor of Science from Virginia Tech.

Steve Button


(Chief Financial Officer)

Steve Button has over 20 years of experience in finance, treasury, planning, and analysis in both public and private sectors with an emphasis in the wireless industry. He joined Proxim to serve as the company’s Chief Financial Officer in October 2011 and is responsible for the company’s worldwide financial operations. Prior to joining Proxim, he was the Vice President of Finance and Treasurer at Covad Communications, a national provider of voice, data and wireless services. Prior to Covad he was the CFO for NextWeb, one of the nation’s largest fixed wireless broadband providers, acquired by Covad Communications in 2006. Steve’s other positions include Vice President of Finance and Controller at Worldwide Wireless Networks and Global Pacific Internet which were both pioneers in the wireless service provider industries. Mr. Button began his career at Coopers and Lybrand after receiving his Bachelor of Sciences Degree in Accounting form Oral Roberts University.

David L. Renauld


(Vice President, Corporate Affairs, General Counsel, and Secretary)

David L. Renauld has been our Vice President, Corporate Affairs, General Counsel, and Secretary since November 1999. From January 1997 to November 1999, he was an attorney with Mirick, O'Connell, DeMallie & Lougee, LLP, a law firm in Worcester, Massachusetts. From September 1991 to December 1996, he was an attorney with Richards, Layton & Finger; a law firm in Wilmington, Delaware. Mr. Renauld holds a B.A. in mathematics/arts from Siena College and a J.D. from Cornell University.

David Sumi


(Senior Vice President – Engineering and Product Management)

David Sumi brings with him a deep and experienced understanding of the wireless marketplace and technologies from WiFi to LTE. He was one of the early pioneers establishing 4G/WiMAX as a viable technology during its infancy stages. His extensive experience in both International and Domestic markets combined with his technical grounding in the RF and networking issues associated with wireless systems, gives him a solid overall perspective on the wireless domain. By translating complex technical abilities into business value, he is able to establish strategic technology direction, key partnerships and define product roadmaps with clear vision and efficient execution.
Most recently David has been a contributing technology consultant to a variety of Silicon Valley wireless communications companies. Between 2004 and 2009, David held key executive technology positions at SOMA and TeleCis where he led the Engineering and Product Management teams to translate complex technical capabilities into successful products.
David’s strong engineering management skills were developed during his early years NorTel and SAIC. David graduated from the Georgia Institute of Technology with a Bachelor of Science in Applied Physics. David also serves as the Secretary of the WIMAX Forum.