Mikel Lindsaar is well known in the Ruby on Rails community as the author of "mail," the Ruby email handling library which has been ed over 90 million times and used by almost every Ruby on Rails installation in the world. He is known for his blogs and for his extensive work on the Ruby on Rails "ActionMailer" component. Mikel is a member of the Ruby on Rails commit team. Mikel wrote this book after being asked "Why do you use Ruby on Rails?" The answer was simple - Profitability and Productivity. In this book he explains how he came to that conclusion.