1998 – 2002, Physicist, Argonne National Lab
2002 – 2011, Staff Scientist, SLAC
2010 – 2011, FEL Physics Group Leader, SLAC
2011 – 2012, Senior Staff Scientist, SLAC
2011 – Present, FEL R&D Program Leader, SLAC
2013 – Present, Associate Professor, Photon Science and PPA, SLAC and Stanford University