ABOUT THE AUTHORS The lead author, Dr. Salman Malik (aka Sal), is a published ex-scientist, a Bioengineer, entrepreneur, a pro-barber, and author. Following his successes in academia and the launch of his first business; an innovative pharmaceutical start-up (where he raised a seven-figure investment), he then transitioned into the barbering industry. He launched the Etch® (shaving) brand, formulating his own shaving products and featuring in all industry leading magazines, including British GQ. He also has backing from angel investors and experts to grow the business into a global brand. His scientific background, understanding of hair properties and trichology, and passion for the barbering industry has inspired him to educate modern barbers in their scientific know-how, so they better understand the fundamental element driving the entire trade. Tracey Walker is a Fellow Member of the Institute of Trichologists and runs her own trichology practice in Cambridgeshire. For the past seven years she has also held the post of Director of Education for the Institute. Coming from a hairdressing background, Tracey understands the importance of a knowledge of basic science in all areas pertaining to the hair and scalp. She has been the author of many articles which have featured in the press and academic journals and has given presentations on trichology to hairdressing students in colleges. She is passionate about continual professional development and loves sharing her knowledge and experience to educate and encourage others.