After careers as an analytical chemist in semiconductor electronics, pharmaceuticals and academic research, Dan turned his interest to conservation. With over 30 years experience in analytical mass spectrometry, Dan is currently in private practice specializing in applications of mass spectrometry in art, cultural heritage, and wildlife forensics. Recent projects include characterization of pigments and binding media in historic Australian Aboriginal bark paintings and using peptide mass fingerprinting to identify materials in Native Alaska objects, Cross River dance masks, Dr. Auxoux's papier mâché anatomical models, Pre-Columbian Mexican feather shields and coatings on photographic salt prints.