Dr. David M. Wiles, Canada, R&D Consultant to EPI, is a scientist with over 36 years of experience in polymer stabilization and degradation of plastics in the environment. Dr. Wiles is internationally recognized as an expert in the photochemistry and microbiology of macromolecular materials. From 1975 to 1990, he was Director-General of the Chemistry Division at the National Research Council of Canada, and is currently the President of Plastichem Consulting. Dr. Wiles is a Fellow of the Royal Society of Canada, the Chemical Institute of Canada and the Textile Institute (UK). He is a recipient of the Queen’s Silver Jubilee Medal and the Dunlop Lecture Award. He holds a Ph.D. in Physical Chemistry and has authored over 200 research papers, 6 book chapters and is credited with 13 patents in the field of chemistry. He is a member of the Editorial Board of the SCI/Wiley periodical Polymer International. In 1989 the Society of the Plastics Industry of Canada presented him with the Canplast Award for outstanding leadership and continuous contribution to the Canadian plastics industry. Dr. Wiles has been a consultant to EPI since 1992 and oversees many research and certification projects.