Committee Composition

Below is a summary of our committee structure and membership information. To read more about any of the committees, click on committee names in the chart below.
Chairperson Chairperson Committee Member Member Financial Expert Financial Expert
 Audit CommitteeCompensation CommitteeNominating and Corporate Governance Committee
Tom A.  Alberg 
Tom A.  Alberg
Director


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 presid... 
Committee Member   Committee Member
Clinton Bybee 
Clinton Bybee
Director


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 Asso... 
Committee Member Chairperson Committee Member
Gregory Sessler Financial Expert
Gregory Sessler
Director


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... 
Chairperson Committee Member  
Peter van Oppen 
Peter van Oppen
Chairman


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. P... 
   Chairperson
Theresa Wise 
Theresa Wise
Director


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 receiv... 
  Committee Member  
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