In June 1999, I received my bachelor degree from Electrical Engineering Department of Tsinghua University in Beijing, P.R.China. I also received my master degree from Electrical Engineering Department of Tsinghua University in Jan. 2002. My advisor in my Alma Mater is Professor Kexiong Tan. After graduation, I worked in Shanghai Baosight Software Co. Ltd as an automation engineer for 3.5 years. To pursue my PhD degree, I joined the ECSE Department at Rensselaer Polytechnic Institute (RPI)  in August 2005 and did research under the supervision of Professor Qiang Ji. My research interest is focused on machine learning, computer visin, pattern recognition and image processing, especially on probabilistic graphical models (PGMs) such as Markov Random Fields, Conditional Random Fields, Bayesian Network, Dynamic Bayesian Network, Chain Graph, Factor Graph, Hybrid Probabilistic Graphical Models and their application to computer vision and image analysis problems, including image and video segmentation, human upper body tracking, active image labeling, complex human activity recognition, sensor fusion, affective computing, terrain classification, visual knowledge discovery, etc.