Board of Directors


Mike Burkland

President and Chief Executive Officer (CEO), Five9

Mike Burkland is a seasoned executive with a proven ability to drive growth, strategic focus and operational excellence at high growth technology companies. Mike has been CEO of Five9 since January 2008. Under Mike’s leadership, revenue has more than quadrupled, and Five9 has become one of the largest and fastest growing providers of cloud-based call center software. Five9 has received several prestigious industry awards, and recognition for revenue and growth performance. Prior to joining Five9, Mike was CEO of a handful of enterprise software and SaaS companies in market segments ranging from systems management and content management to security and CRM, and has led three private companies through successful acquisitions by larger public companies. Earlier in his career he held various positions at Oracle and BMC. He holds MBA and BA degrees from the University of California at Berkeley.


Mitchell Kertzman

Partner, Hummer Winblad Venture Partners

Mitchell Kertzman is a Partner at Hummer Winblad Venture Partners. He has over 30 years of experience as a CEO of public and private software companies. Most recently, Mitchell was Chairman and CEO of Liberate Technologies, a provider of platform software for the delivery of digital services by cable television companies. Before joining Liberate, he was Chairman of the Board and CEO of Sybase, Inc. Mitchell was founder and CEO of Powersoft, which merged with Sybase in February 1995.


David Welsh

Partner, Adams Street Partners

Dave Welsh is a Partner with Adams Street Partners with over 15 years of investment and operational experience. Prior to Adams Street, Dave worked for McAfee, Inc. as Executive Vice-President, Corporate Strategy and Business Development. At McAfee, he was in charge of overall corporate strategy, mergers and acquisitions and strategic alliances. Prior to joining McAfee, Dave served as a General Partner for Partech International, an international venture capital firm, and Vice-President of Corporate Development at Portal Software. He currently serves on the Boards of Brightroll, JasperSoft, KPG, LogRhythm and WebVisible. Dave received a BA from UCLA and a JD from UC Berkeley and Harvard Law School.


Tim Wilson

Partner, Partech International

Tim joined Partech International in 2001 and focuses on communications and components investments. Between 1997 and 2001, Tim was the Chief Marketing Officer for Digital Island, a Partech portfolio company. The company was acquired by Cable & Wireless in 2001 for $350M. Prior to Digital Island, Tim was a General Manager at Lucent Technology where he led the international voice communications product management team (now Avaya) with P&L for product lines generating over $2B in annual sales and coauthored a VOIP related patent. Before Lucent, Tim held a variety of senior management positions within AT&T (North America and Australia) and AT&T Bell Labs from 1983-1995. Tim's current portfolio companies include Discera, Invensense, Spudnik and Teknovus where he holds a board seat with each company.He graduated summa cum laude, Phi Beta Kappa from Bowdoin College receiving his undergraduate degree in Physics. He received his MBA from Duke University's Fuqua School of Business where he was named a Fuqua Scholar.


Dave DeWalt

Dave DeWalt has more than 25 years of experience building innovative, industry-leading technology companies, creating billions of dollars in shareholder value. Dave currently serves as chairman of the Polycom and Mandiant Boards of Directors, in addition to his Board of Director roles at Delta Airlines and Jive Software. Previously, he held executive positions at technology companies including Oracle, EMC, Documentum, Intel and McAfee. Dave has been named one of the top five CEOs of publicly traded software companies by “Institutional Investor” magazine and one of the 25 most influential executives in the technology industry by readers of “CRN” magazine. In addition, DeWalt is a recognized authority on cyber security and was appointed in May 2011 by President Barack Obama to the National Security Telecommunications Advisory Council (NSTAC).


Jack Acosta

Jack Acosta has served in a Board role for multiple companies. Previously, Jack served as Chief Financial Officer and Vice President, Finance for Portal Software. Prior to Portal Software, Jack served as Executive Vice President and Chief Financial Officer as well as Vice President, Engineering Services, Integration and Business Management for Sybase, Inc., a database company. Jack also served as President, Chief Operating Officer and a director of Tanon Manufacturing, Inc., a manufacturing and engineering services company. Prior to these assignments, Jack held various management positions at Ungermann-Bass, Inc., Atari, Inc., Diablo Systems, Inc., and Ford Motor Company.

Board Observers


Dave Samuel

Managing Director, Mosaic Venture Partners

Dave Samuel is Managing Director at Mosaic Venture Partners. Dave was President of Rogers Wave from its inception and led North America's most aggressive rollout of high-speed Internet access over cable. Dave was also a consultant with McKinsey & Company and a Senior Executive with Torstar Corporation. Early in his career, Dave was an investment banker with Morgan Stanley & Co., where he executed various financial transactions.