Practical Modern Hair Science 536 J. Alan Swift earned both a Bachelor of Science in Chemistry and a PhD in Textiles from the University of Leeds, England. He worked for Unilever Research in the United Kingdom for 32 years where he became section manager and senior scientist. Since 1994 he has engaged in consultancy work for major international hair toiletry companies. He has published more than 90 journal papers, book chapters, and monographs, mainly concerned with the chemistry, structure, and physical properties of human hair. Awards for his work have included both the Joseph P. Ciaudelli and Literature awards of the US Society of Cosmetic Chemists and an IFSCC award for best conference paper. He is currently an honorary member of staff in the Faculty of Materials at the University of Manchester, England. R. Randall Wickett, professor of Pharmaceutics and Cosmetic Science at the University of Cincinnati’s James L. Winkle College of Pharmacy, earned his PhD in Biophysics from Oregon State University in 1972 and was a postdoctoral fellow at the University of Minnesota from 1972 to 1974. Thereafter, he worked at Procter and Gamble 1974 to 1985, performing basic and applied research on skin and hair. In 1985 he moved to the SC Johnson Company where he was in charge of clinical and biophysical testing of skin and hair care products. In 1991 he joined the University of Cincinnati. Wickett has authored more than 100 scientific publications and several patents and has given more than 100 invited presentations. He is a Fellow of the Society of Cosmetic Chemists and has received numerous technical awards from the SCC including the Maison G. de Navarre Medal Award, the SCC’s highest honor for technical achievement. He was editor of the Journal of the Society of Cosmetic Chemists from 1991 to 1997 and past president of the SCC. Chao-Chun Yang, MD, is an assistant professor in the Department of Dermatology at the National Cheng Kung University Hospital in Taiwan. He was a research fellow at Albert M. Kligman Laboratories, associated with the Department of Dermatology at