Yi Wang, Chairman of the Board of Directors and Chief Executive Officer

Yi Wang is one of our founders, and has served as the chairman of our board of directors and our chief executive officer since the inception of our company. Prior to that, Dr. Wang served as a product director at AdChina, a leading online advertising platform in China, from April 2011 to August 2012. From July 2009 to April 2011, he served as a product manager at Google and was responsible for various key features and systems of Google Analytics and Google's cloud infrastructure. He received his bachelor's degree and master's degree in electrical engineering from Tsinghua University in 2003 and 2005, respectively, and his Ph.D. degree in computer science from Princeton University in 2009.

Zheren Hu, Director and Chief Technology Officer

Zheren Hu is one of our founders, and has served as our director and chief technology officer since the inception of our company. He has also been in charge of our English for Adults business since April 2018. From 2010 to 2011, Mr. Hu served as an engineer at Quantcast, an AI-driven data analytics company. Mr. Hu received his bachelor's degree of engineering in computer science from Shanghai Jiao Tong University in 2006 and his master's degree of science in management information systems from the University of Arizona in 2008.

Hui Lin, Director and Chief Scientist

Hui Lin is one of our founders, and has served as our director and chief scientist since the inception of our company. Prior to that, Dr. Lin served as a research scientist at Google from 2012 to 2013. Dr. Lin received his bachelor's degree and master's degree in electrical engineering from Tsinghua University in 2003 and in 2006, respectively, and his Ph.D. degree in electrical engineering from the University of Washington in 2011.

Jenny Hong Wei Lee, Director

Ms. Jenny Hong Wei Lee has served as our director since June 2014. Ms. Lee has served as the managing partner of GGV Capital since 2005. Prior to that, she had operations and finance work experience at JAFCO Asia from August 2002 to April 2005, at Morgan Stanley from July 2001 to July 2002 and at Singapore Technologies Aerospace from July 1995 to September 1999. Ms. Lee also serves as a director of various privately held companies. Ms. Lee received her bachelor's degree from Cornell University in 1994, her master's degree in electrical engineering from Northwestern University in 1995, and her M.B.A. degree from Kellogg School of Management in 2001.

Jinjian Zhang, Director

Mr. Jinjian Zhang has served as our director since July 2015. Mr. Zhang joined Trustbridge Partners in July 2012 and currently serves as a director. Mr. Zhang also serves as a director of various privately held companies in China. Mr. Zhang received his bachelor's degree in electrical engineering from University of Electronics Science and Technology of China in 2011, and his master's degree in electronic circuit and system from Fudan University in 2014.

Christopher Ludwig Eisgruber, Independent Director

Mr. Christopher Ludwig Eisgruber has served as our independent director since September 2018. Mr. Eisgruber was elected Princeton University's 20th president in April 2013 and has assumed office since July 2013, serving as the chief executive officer to manage a world-class university. Prior to that, he served as the provost of Princeton University for almost ten years from 2004 to 2013, serving as the second-ranking official as well as the chief academic and budgetary officer of the university. From 2001 to 2004, Mr. Eisgruber served as the Laurence S. Rockefeller Professor of Public Affairs in the Woodrow Wilson School and the Centre for Human Values at Princeton University. Mr. Eisgruber received his bachelor's degree in physics from Princeton University in 1983, his master's degree in politics from Oxford University in 1987, and his J.D. degree from the University of Chicago Law School in 1988.

Li‐Lan Cheng, Independent Director

Dr. Li‐Lan Cheng has served as our independent director since September 2018. Dr. Cheng has served as the chief operating officer of E‐House (China) Holdings Limited, a real estate services company in China, since 2012 and previously served as its chief financial officer from 2006 to 2012. Dr. Cheng has also served as the acting chief financial officer of Leju Holdings Limited (NYSE: LEJU), since June 2017. Dr. Cheng has also been an executive director of E-House (China) Enterprise Holdings Limited (SEHK: 2048), since March 2018. From 2005 to 2006, Dr. Cheng served as the chief financial officer of SouFun Holdings Limited, a leading real estate internet portal and a leading home furnishing website in China. From 2002 to 2004, he served as an executive director and the chief financial officer of SOHO China Limited, a real estate developer in China. Currently, Dr. Cheng also serves as an independent director of 51job, Inc. (Nasdaq: JOBS). Dr. Cheng received his bachelor's degree in economics from Swarthmore College and his Ph.D. degree in economics from the Massachusetts Institute of Technology. Dr. Cheng is a chartered financial analyst (CFA).