- Conservation Scientist, Freer Gallery of Art and the Arthur M. Sackler Gallery 2014 -
- Conservation Scientist, Museum Conservation Institute 2008 - 2014
- Conservation Scientist, Walters Art Museum 2004 - 2008
- Assistant Conservation Scientist, Freer Gallery of Art and the Arthur M. Sackler Gallery 1998 - 2004
Application of spectroscopy and chromatography to the study of artists' materials; Investigation of degradation of artists' materials; Technical studies of artists' working methods and works of art; Application of new scientific techniques to the study of artists' materials and works of art, especially non-invasive techniques.