Addicus Books has signed author Dr. Oliver Courtin-Clarins for his new book, The Courtin Concept--Six Keys to Great Skin at Any Age. The English-language book will be launched in the Fall 2007 as a tie in to a new line of cosmetics being rolled out. Dr. Courtin-Clarins, of Paris, France, is Managing Director of Clarins, the European leader in premium skin care products with products sold through a selective distribution network of 19,000 points of sale in more than 150 countries.