Board of Directors

Clinton Bybee has served as a member of our board of directors since January 2008 and chairman of our compensation committee since July 2014. He is a managing director of ARCH Venture Partners, a venture capital firm he joined in June 1994. Mr. Bybee has helped organize, finance and develop numerous companies and is a board member of XTERA Communications, a publicly-traded technology company and several privately-held companies. Mr. Bybee is an organizing member of the Texas Venture Capital Association and currently serves as its president. Previously, Mr. Bybee held various engineering positions with Amoco Corporation. Mr. Bybee received a B.S. in petroleum engineering from Texas A&M University and an M.B.A. from the University of Chicago.

Daniel Gibson has served as a member of our board of directors since June 2018. Mr. Gibson is a founding partner of Sylebra Capital Management, and has been a portfolio manager since June 2011 and chief Investment Officer since January 2018. Sylebra Capital Management is a Hong Kong-based investment firm focused on the technology, media and telecom industries globally. Prior to that, he worked at Coatue Capital from 2008 to 2011 as a partner and analyst. From 2006 to 2008 he was an associate at Calera Capital, a private equity fund based in Boston. He started his career with UBS Investment bank in New York as a member of the media group. Mr. Gibson currently serves on two private company boards. Mr. Gibson received his B.A. in economics from Amherst College.

Cathal Phelan has served as a member of our board of directors since September 2019. Mr. Phelan was the chief executive officer of RAPT Touch Inc., a privately held IP provider for multi-touch systems, from November 2014 to November 2019. Prior to joining RAPT Touch, Mr. Phelan founded his own consulting firm, Atticotti LLC, in April 2013. He served as CEO and president of Ubicom, Inc., from May 2006 to September 2008, and held several positions at Cypress Semiconductor Corporation from 1991 to 2006. Mr. Phelan graduated from the Engineering School of Trinity College Dublin in Ireland, where he received a B.A. in mathematics and a B.A.I. in electronic engineering in 1984 and subsequently a M.S.E.E. in micro-electronic engineering in 1985.

Chris Diorio, Ph.D., one of our co-founders, has served as a member of our board of directors since April 2000, as chief executive officer since November 2014 and as vice chairman since September 2013. Previously, he served as our chief strategy and technology officer from September 2013 to November 2014, chief technology officer from November 2006 to September 2013, chairman from April 2000 to January 2013, vice president of engineering from 2004 to 2006 and as a consultant to us from April 2000 to June 2004. In addition, he is an affiliate professor of computer science and engineering at the University of Washington, a director and chairman of the RAIN RFID Alliance and former director of Bluegiga Technologies Ltd. Dr. Diorio received a B.A. in physics from Occidental College and an M.S. and Ph.D. in electrical engineering from the California Institute of Technology.

Gregory Sessler has served as a member of our board of directors and as chairman of our audit committee since April 2011. Mr. Sessler is the president and chief executive officer and former chief financial officer of Spiration, Inc., a medical device company (acquired by Olympus Corporation of the Americas in 2010), which he joined in 2002. Previously, Mr. Sessler served as senior vice president and chief financial officer of Rosetta Inpharmatics, Inc., a biotechnology company (acquired by Merck & Co. in 2001), chief financial officer of Sonus Pharmaceuticals, Inc. (now OncoGenex Pharmaceuticals, Inc.), a pharmaceutical company, and chief financial officer of MicroProbe Corporation, a biotechnology company. Mr. Sessler previously served as chairman of the audit committee of Marina Biotech, Inc. and as a member of the audit committee of Corixa Corporation (acquired by GlaxoSmithKline plc). Mr. Sessler received a B.S. in accounting from Syracuse University and an M.B.A. from the Stanford Graduate School of Business.

Theresa Wise has served as a member of our board of directors since May 2016. Ms. Wise was senior vice president and chief information officer for Delta Air Lines, Inc., an airline company, from October 2008 to April 2016. Prior to joining Delta, Ms. Wise held a number of positions at Northwest Airlines Corporation, an airline company, including serving as the company’s chief information officer from 2001 until Northwest Airlines Corporation’s merger with Delta Air Lines in 2008. Ms. Wise received a B.A. in mathematics and chemistry from St. Olaf College and a Ph.D. and M.S. in applied math from Cornell University.

Peter van Oppen has served as our chairman and a member of our board of directors since January 2013. Mr. van Oppen has been a partner at Trilogy Partnership, a private investment firm focused on technology and telecommunications, since 2006. Prior to joining Trilogy, Mr. van Oppen served as chairman and chief executive officer of Advanced Digital Information Corporation, or ADIC, a publicly-traded storage management software company, from 1994 through its acquisition by Quantum Corp. in 2006. Prior to ADIC, Mr. van Oppen served as president and chief executive officer of Interpoint, a predecessor company to ADIC, from 1989 until its acquisition by Crane Co. in October 1996, and has also been a consultant at PricewaterhouseCoopers and Bain & Company. He is currently a director of Level 3 Communications, Inc. He is a former director of Isilon Systems, Inc. and Western Wireless Corporation. Mr. van Oppen currently serves as a member of the UW Medicine Board and as chair of its Finance and Audit Committee, is former chairman of the board of trustees and former chairman of the investment committee at Whitman College and serves on the board of directors of several private companies. In addition, Mr. van Oppen has supervised public company chief financial officers and is a member, on inactive status, of the American Institute of Certified Public Accountants. Mr. van Oppen received a B.A. in political science from Whitman College and an M.B.A. from Harvard Business School.

Tom A. Alberg has served as a member of our board of directors since September 2000. Mr. Alberg has been a managing director of Madrona Venture Group, LLC, a venture capital firm, since September 1999, and a principal in Madrona Investment Group, LLC, a private investment firm, since January 1996. Prior to co-founding Madrona Investment Group, Mr. Alberg served as president of LIN Broadcasting Corporation, executive vice president of McCaw Cellular Communications, Inc., and executive vice president of AT&T Wireless Services. Previously, he was chair of the executive committee and partner at Perkins Coie, the Northwest’s largest law firm. Since 2006, Mr. Alberg has served as a director of Amazon.com. From February 1998 to August 2006, he was a director of ADIC. Mr. Alberg received a B.A. in international affairs from Harvard College and a J.D. from Columbia Law School.