Since 2011 Staff Scientist, Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM.

2009-2011 Director Funded Fellow, Los Alamos National Laboratory, Los Alamos, NM.

2008-2009 CNLS Postdoctoral Research Associate, Los Alamos National Laboratory, Los Alamos, NM.

2007-2008 Postdoctoral Scholar at Penn State University, University Park, PA.

2001-2007 Research Assistant at Penn State University, University Park, PA.

Referee for Science, Physical Review Letters, Physical Review B, Physical Review E, New Journal of Physics, Nanoletters, Physics Letters A, Journal of Physics: Condensed Matter, Journal of Chemical Physics, Bulletin of Mathematical Biology, Mathematical Bioscences.