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Biography PhotoBrent CallinicosChairman of the Audit Committee

Brent Callinicos has served as our independent director since October 2015, and as the chairman of our audit committee since April 2016. Mr. Callinicos is currently an advisor for Virgin Hyperloop One and served as the chief operating officer and the chief financial officer of Virgin Hyperloop One from January 2017 to February 2018. Prior to that, Mr. Callinicos served as the chief financial officer of Uber Technologies Inc. from September 2013 to March 2015, and then as an advisor for 18 additional months. Prior to joining Uber, he worked at Google from January 2007 to September 2013, where he last served as vice president, treasurer and chief accountant. He also led green energy investments and financial services at Google Inc. From 1992 to 2007, he served in a variety of increasingly senior roles at Microsoft Corporation, where he last served as corporate vice-president and divisional chief financial officer of the Platforms and Services Division, and oversaw Microsoft’s Worldwide Licensing and Pricing and Microsoft Financing. He currently serves on the board of directors of PVH Corp. (NYSE: PVH), and Rubicon Global, a private company. Mr. Callinicos is a certified public accountant. Mr. Callinicos received a bachelor’s degree from the University of North Carolina at Chapel Hill and an M.B.A. degree from the Kenan-Flagler School of Business at Chapel Hill.