Professor at School of Traffic and Transportation, Beijing Jiaotong University (P.R. China); from 2010 to 2016 Associate Professor at the same School; from 2015 to 2015 Assistant Director of Transportation Management Bureau of Daxing District in Beijing (P.R. China); from 2014 to 2015 Visiting Scholar (Affiliate Associate Professor) of Brigham Young University (U.S.A.); from 2011 to 2012 Assistant Vice-Dean responsible for the undergraduate education and teaching management of School of Traffic and Transportation, Beijing Jiaotong University (P.R. China); from 2009 to 2010 Research Fello at Graduate School of Environmental Studies, Nagoya University (Japan).