Lei Zhang joined Alibaba Group’s in 2011，now he is the Head of data security in the data middle office at Alibaba，He has been in charge of the Alibaba Group’s data access and operations work since 2014. He manages the Group’s Data Unification by making the data of more than 10 business units (including Youku Tudou, UC, Youmeng+, Shenma, Gaode,Eleme) getting access to Group’s ODPS. Since 2015, he continuously updates and improves the OneData system, which promotes the efficiency in Data R&D by over 30%. Besides, he guarantees the health and stability of Group’s Data assets. All of his works lead to a solid foundation of the big data strategy of Alibaba Group.