Mr. Kelvin Wing Kee Lau is our CFO. Prior to joining us, Mr. Lau was the chief financial officer of Square Panda Inc., a U.S.-based AI education start-up company, between July 2018 and August 2019. Between March 2007 and June 2018, Mr. Lau first served as the chief financial officer of Perfect World Co., Ltd., a China-based online game company (“Perfect World”) listed on Nasdaq between 2007 and 2015, and later as the chief financial officer of Perfect World Holding Co., Ltd., the holding company of Perfect World. Between November 2004 and February 2007, Mr. Lau was the chief financial officer of Beijing Media Corporation Limited, a company listed on the Stock Exchange of Hong Kong Limited. From 2000 to 2004, Mr. Lau was a group finance director of Shanghai Ogilvy & Mather Advertising Limited Beijing Branch. From 1990 to 2000, Mr. Lau worked at Hong Kong, Shanghai and Beijing offices of PricewaterhouseCoopers, lastly as a senior manager in Beijing. Mr. Lau received his bachelor's degree in business administration from Hong Kong Baptist University in 1990. He received his EMBA degree in 2011 from Cheung Kong Graduate School of Business in China. Mr. Lau is a member of Association of Chartered Certified Accountants and Hong Kong Institute of Certified Public Accountants.
Ying Sun is our vice president. Ms. Sun has served as our vice president since December 2009, responsible for our nation-wide operations. Ms. Sun joined us in June 2005 as the general manager of our Beijing learning centers. Between 2007 and 2009, she was the general manager of our northern region. From 1999 to 2005, Ms. Sun worked in Gloria Hotels and Resorts, serving in various sales and human resources-related roles. Ms. Sun received a bachelor’s degree in tourism economics management from Dongbei University of Finance and Economics in China.