What type of details about jack liangjie xu  can be gathered from the following bio?  Bio: jack liangjie xu -lrb- simplified chinese : 许良杰 ; traditional chinese : 許良傑 -rrb- , more commonly known as jack xu in english , is the former co-president and chief technology officer -lrb- cto -rrb- of sina corporation , the operator of sina weibo , the most influential social network in china . he formerly worked as the corporate vice president for cisco 's unified communications business unit , vice president of engineering & research at ebay , and cto at netease . xu was born in guangdong province of china . his father died when he was in his sophomore year of high school . he took the national college entrance examination a year early , and was accepted by sun yat-sen university . after graduating with his b.a. and m.a. , xu went to the united states to pursue a phd at the university of california at berkeley , where he was a member of berkeley 's text retrieval conference -lrb- trec -rrb- competition team . he began his career with excite in 1996 . in 1998 , he began leading the development of the excite search engine . from 2000 to 2002 , xu served as chief technology officer at netease in beijing , helping william ding to promote the netease listed . in october 2002 , xu returned to silicon valley . he was appointed as ebay 's vice president of engineering & research and oversaw ebay search , listings and research labs . in 2006 , xu was inducted as an ebay fellow . in may 2008 ceo john chambers recruited him as cisco 's corporate vice president . in march 2015 , jack xu and jeff xiong -lrb- former cto of tencent -rrb- launched their venture capital firm , seven seas venture partners , to invest in early-stage start-ups .
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