Christopher has 40 years of experience with ion exchange chromatography and has worked for Dionex, the industry leader in this field, for more than 35 years where he has been actively involved in ion chromatography research and development. He holds more than 80 US patents with numerous foreign equivalents, most of which are related to the field of ion chromatography. He is author or co-author of more than 120 published articles and eight chapters.