Mr. Lin has served as one of our directors since May 2014. Mr. Lin has been a Partner at Sequoia Capital Operations LLC, a venture capital firm ( Sequoia Capital ) since October 2010. From June 1999 to December 2014, he served as Co-Founder and General Manager at Venture Frogs, LLC, a venture capital firm. From January 2005 to December 2010, Mr. Lin served as Chairman of the Board and Chief Operating Officer of Zappos.com, an online retailer acquired by Amazon.com, Inc., a multinational technology company ( Amazon ), and from January 2001 to June 2005, he served as Vice President of Finance and Business Development of Tellme Networks, a voice recognition services and platform company acquired by Microsoft. Prior to this, from 1996 to 1998, Mr. Lin served as Vice President of Finance and Administration of LinkExchange, a banner advertising exchange acquired by Microsoft. He currently serves on the board of directors of Airbnb, Inc., a lodging and experiences marketplace company ( Airbnb ), and serves as a director of several private companies. Mr. Lin holds a B.A. in Applied Mathematics from Harvard University and an M.S. in Statistics from Stanford University. Mr. Lin was selected to serve on our board of directors because of his extensive experience advising the senior management of high-growth companies like ours, his business and leadership experience, his financial and investment expertise, and his knowledge of technology companies.