Jan. 2007- present       Division of Built Environment and Services Engineering 
                                      School of Human Settlements and Civil Engineering 
                                      Xi’an Jiaotong University 
                                      Professor
Apr. 2003-Dec. 2006    Division of Built Environment and Services Engineering 
                                      School of Human Settlements and Civil Engineering 
                                      Xi’an Jiaotong University
                                      Associate Professor
Apr. 2001-Apr. 2003    Division of Mechanical Engineering
                                      The Hong Kong Polytechnic University
                                      Research Fellow
May.1999-Apr. 2001    Division of Built Environment and Services Engineering
                                      School of Energy and Power Engineering
                                      Xi’an Jiaotong University
                                      Lecturer