About the Instructors
Trefor Evans, PhD
Institute Fellow, Director of Research – TRI Princeton
Dr. Trefor Evans has worked in the hair care industry for 30 years. The first 16 of these were spent as a scientist and manager in the product development labs of large consumer good companies. He then served for five years as Director of Measurement Services at TRI-Princeton, where he now holds the titles Director of Research and Institute Fellow. He is also a regular Columnist for Cosmetics & Toiletries magazine and Technical Editor for the Journal of Cosmetic Science.
Dr. Evans is highly active in the hair care industry through many working relationships with companies of all shape, size, and background. He is a regular presenter at International Hair Conferences and has been an invited speaker at many technical meetings and symposia. He has been Chairman for the past four iterations of the International Conference on Applied Hair Science.
He has published numerous articles in trade magazines and the scientific literature and is co-author and co-editor of the book “Practical Modern Hair Science”. He holds seven patents in the area of hair care and his research work has been awarded by the Society of Cosmetic Chemists on three separate occasions.
Dr Evans regularly teaches and facilitates training classes on the topics of hair science and hair product claims which have been held in the US, Europe and Asia. He guest lectures on Hair Science and the Hair Care Industry for a variety of academic cosmetic programs and has instructed at educational events organized by the Society of Cosmetic Chemists.
Roger McMullen, PhD
Principal Scientist - Ashland
Dr. Roger McMullen has over 20 years of experience in the personal care industry with specialties in optics, imaging, and spectroscopy of hair and skin. Currently, he is Principal Scientist in the Material Science department at Ashland Specialty Ingredients G.P. Dr. McMullen received a B.S. in Chemistry from Saint Vincent College and completed his Ph.D. in Biophysical Chemistry at Seton Hall University with Professor Stephen P. Kelty. In addition, Roger worked under the mentorship of Dr. Janusz Jachowicz at International Specialty Products for approximately 10 years. Roger actively engages and participates in educational activities in the personal care industry. Every year he instructs courses in Hair Science at TRI-Princeton and every two years he teaches a course that he designed on Imaging Technologies and Image Analysis Techniques for Personal Care at the SCC national office. He also teaches the Basic Hair Science course in the continuing education program of the SCC.