About the Author
Sam Ruby is a prominent software developer who is a co-chair of the W3C HTML Working Group and has made significant contributions to many of the Apache Software Foundation's open source software projects. He is a Senior Technical Staff Member in the Emerging Technologies Group of IBM.
Dave Thomas, as one of the authors of the Agile Manifesto, understands agility. As the author of "Programming Ruby," he understands Ruby. And, as an active Rails developer, he knows Rails.
David Heinemeier Hansson is the creator of the Rails framework.