Associate Professor, Nov.2014-Present, Department of Electrical and Computer Engineering, University of Massachusetts Lowell, Lowell, MA, USA

Assistant Professor, May 2010-Nov. 2014, Department of Biomedical Engineering, Wake Forest University Health Sciences, Winston-Salem, NC, USA

Research Scientist, Nov. 2006-May 2010, VT-WFU School of Biomedical Engineering & Science, Virginia Tech. , Blacksburg, VA, USA

Adjunct Assistant Professor, Apr. 2007-May 2010, Department of Radiology, Wake Forest University Health Sciences, Winston-Salem, NC, USA

Associate Professor, Sept. 2004-May 2010, College of Telecommunication Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang, China (without pay)

Associate Research Scientist, Jun. 2006-Nov. 2006, CT/Micro-CT Laboratory, Department of Radiology, University of Iowa, Iowa City, IA, USA

Research Associate, Sept. 2004-May 2006, CT/Micro-CT Laboratory, Department of Radiology, University of Iowa, Iowa City, IA, USA

Instructor, Jul. 2003-Sept. 2004, College of Telecommunication Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang, China

Visiting Student, Sept. 2002-Nov. 2002, Media Computing Group, Microsoft Research Asia, Beijing, China

Research Assistant, Sept. 1998-May 2003, Institute of Image Processing, Xi'an Jiaotong University, Xi’an, Shaanxi, China