Wei Zhang is now a Senior Researcher in JD AI Research. He received his Ph.D degree from City University of Hong Kong, Hong Kong, China in 2015. He was a visiting scholar in DVMM group of Columbia University, New York, USA in 2014. His research interests include large-scale visual instance search and mining, multimedia and digital forensic analysis. He was in VIREO (superviser: Chong-Wah Ngo) during 2011 ~ 2015. He was a visiting student in DVMM group (advisor: Shih-Fu Chang), Columbia University during 2013 ~ 2014.