Jarkko Laine is the owner and chief executive officer of O'Design, a Rails-based web design shop. He has been using Ruby on Rails since 2004 and has contributed patches to the core developer team, as well as contributing to several Rails plug-ins. He has provided Rails consultancy for a number of high-profile organizations, including a major mobile phone manufacturer, Starnet Systems, and Reforge Oy. He has also taught Rails at the university level and delivers lectures about Rails around the world. He lives in Tampere, Finland, with his girlfriend Maria and a growing list of pending household chores. For more information about the book, please visit www.railsecommerce.com.