Author Biographies 533 Jennifer M. Marsh is a Research Fellow in the Beauty Technology Division at The Procter & Gamble Company. She holds a degree in Chemistry from Magdalen College, University of Oxford, and a PhD in synthetic inorganic chemistry from Wolfson College, University of Oxford. She has fourteen years’ experience in the development of new oxidative chemistries and hair quality technologies for hair color and is now a senior technologist in hair care. She is a member of the Society of Cosmetic Chemists and has published 10 papers and 13 patents in the areas of hair color and hair care. Roger L. McMullen, PhD, is currently Senior Research Scientist in the Materials Science Department at Ashland Specialty Ingredients. He earned a Bachelor in Chemistry from Saint Vincent College in 1996 and a PhD in Biophysical Chemistry from Seton Hall University in 2005. Roger has more than 15 years’ experience in the personal care industry. He actively speaks at many international conferences and is the primary author of more than 25 peer- reviewed book chapters and journal articles. For the past five years, he has been editor of Cosmetiscope, the monthly periodical of the New York Chapter of the Society of Cosmetic Chemists. He is also an adjunct professor at Farleigh Dickinson University, where he teaches biochemistry in the Cosmetic Science Master’s program. Prior to pursuing a career in science, Roger served in the US Navy on board the vessel, USS Yorktown (Cg 48). Crisan Popescu was born in Lugoj, Romania. He studied chemistry at the Technical University “Ghe. Asachi” in Iasi, Romania, and at the Textile Engineering Institute (today Donghua University) in Shanghai, graduating as an engineer of textile chemistry. He received his doctorate in chemistry from the University of Bucharest. In 1995 he became professor of textile chemistry at University “Aurel Vlaicu” in Arad, Romania. Since 2001, he has been a scientist at the DWI at RWTH Aachen University in Germany, working on keratins, and has since 2004 been an invited professor of wool chemistry at the University