Fungi cause a spectrum of diseases in humans ranging from comparatively innocuous superficial skin diseases caused by dermatophytes to invasive life-threatening infections caused by species such as Candida albicans, or Crytococcus neoformans. Due to the opportunistic nature of most invasive mycoses, fungal pathogenicity has proven difficult to define. However the application of new genomic and other molecular techniques in recent years has revolutionized the field revealing fascinating new insights into the mechanisms of fungal pathogenesis. In this book, a panel of high profile authors critically reviews the most important research to provide a timely overview.