August 2002 – present
Professor, Department
of Information Science, School of Mathematics, Peking University, Beijing,
China.
July 2019 – June 2022
Chair, Department of
Information and Computational Sciences, School of Mathematics, Peking
University, Beijing, China.
January 1998 - July
2002
Associate Professor,
Department of Information Science, School of Mathematics, Peking University,
Beijing, China.
January 1996 -
December 1997
Postdoctoral fellow,
Microprocessor Laboratory, Abdus Salam International Centre for Theoretical
Physics, Trieste, Italy.
September 1993 -
December 1995
Associate Professor,
Department of Applied Mathematics, Beijing Institute of Technology, Beijing,
China.
August 1989 - August
1993
Lecturer, Department
of Applied Mathematics, Beijing Institute of Technology, Beijing, China.
April 2005 - August
2018
Managing Director of Microsoft
Statistics and Information Technology Laboratory of Peking University.
September 2011 -
March 2012
Associate Director of
CT Lab, Biomedical Imaging Division, VT-WFU School of Biomedical Engineering
& Sciences, Virginia Polytechnic Institute & State University,
Virginia, USA.
August 2008 - October
2008
Research Scholar,
VT-WFU School of Biomedical Engineering & Sciences Virginia Polytechnic
Institute & State University, Virginia, USA.
April 2008
Short-term Visiting
Scholar, Department of Electrical and Computer Engineering, University of
Minnesota, Minnesota, USA.
April 2007 - December
2012
Associate Director of
X-ray Grating-based Imaging (XGI) Lab, Biomedical Imaging Division, VT-WFU
School of Biomedical Engineering & Sciences, Virginia Polytechnic Institute
& State University, Virginia, USA.
March 2007 - August
2011
Associate Director of
Optical Molecular Imaging (OMI) Lab, Biomedical Imaging Division, VT-WFU School
of Biomedical Engineering & Sciences, Virginia Polytechnic Institute &
State University, Virginia, USA.
August 2004 - August
2005
Research Scientist,
Department of Radiology, University of Iowa Hospitals & Clinics, Iowa, USA.
August 2001 - October
2006
Associate Director of
CT/Micro-CT Lab, Department of Radiology, University of Iowa Hospitals &
Clinics, Iowa, USA.
August 2001 - March
2002
Associate Research
Scientist, Department of Radiology, University of Iowa Hospitals & Clinics,
Iowa, USA.
July 2000 - July 2001
Visiting Associate,
Department of Radiology, University of Iowa Hospitals & Clinics, Iowa, USA.
July 2009 - July 2019
Guest Professor of Beihang University (BUAA).
March 2013 - March
2016
Guest Professor
Beijing Information Science & Technology University.
February 2004 - February
2007
Guest Professor of
Shanghai Jiao Tong University.
January 2003 -
December 2005
Guest Professor of
Beijing Union University.
2003
– present
Chinese
Society for Stereology.
2003
– present
Computer
Tomography Theory and Application Society.