1995-1996 Software Engineer, Computer Engineering Bureau, Amman, Jordan.
1997-1998 Visiting Scholar in Biometry and Medical Imaging, RWTH Aachen, Aachen, Germany
2002-2005 Research Associate, Dept. of Radiation Oncology, Washington University, St. Louis, MO
2005-2007 Instructor, Dept. of Radiation Oncology, Washington University, St. Louis, MO
2007-2010 Assistant Professor, Dept. of Radiation Oncology, Washington University, St. Louis, MO
2007-2010 Adjunct, Dept. of Electrical & System Engineering, Washington University, St. Louis, MO
2008-2013 Member of DBBS/Computational Biology program, Washington University, St. Louis, MO
2010-2015 Faculty Member, Medical Physics Unit, McGill University, QC, Canada
2010-2015 Associate Professor, Dept. of Oncology, McGill University, QC, Canada
2011-2015 Medical Scientist, Radiation Oncology Division, Montreal General Hospital, QC, Canada
2012-2015 Associate Member, Experimental Medicine Division, McGill University, QC, Canada
2011-2019 Associate Member, Physics Department, McGill University, QC, Canada
2011-2019 Associate Member, Biomedical Engineering Dept., McGill University, QC, Canada
2015-2019 Associate Professor, Radiation Oncology, Physics Division, University of Michigan at Ann Arbor, MI, USA.
2019-present Professor, Radiation Oncology, Physics Division, University of Michigan at Ann Arbor, MI, USA.