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.
Christian Hellsten is the founder of Aktagon Ltd., a provider of consulting services and custom Internet software development, and chief technology officer of Sanda Interactive Ltd. He has worked on large-scale e-business projects as a consultant for PricewaterhouseCoopers and IBM Business Consulting Services. Christian's background is in J2EE, but he fell in love with Ruby on Rails at first sight, and has been using it professionally ever since to build web applications. When he is not changing the diapers of his two young daughters at his home in Finland, Christian enjoys researching new and better ways of building software.