Stefan Roock works as a consultant and coach for it-agile GmbH (located in Germany). His areas of expertise include agile software development, refactoring techniques and agile project management and among his special interests are refactoring, incremental design and agile customer coaching. Stefan also is frequently a speaker at technical conferences and has published a number of papers and articles. He is co-author of the book "Extreme Programming in Action". You can contact him at stefan@stefanroock.de or http://www.stefanroock.de.

Martin Lippert works as a consultant and coach for it-agile GmbH (located in Germany) and is an expert on agile software development, refactoring techniques and Eclipse technology. His special interests include aspect-oriented programming, refactoring, incremental design and the Eclipse platform. Martin is a frequent speaker at technical conferences and has published a number of papers and articles. He is co-author of the book "Extreme Programming in Action". You can contact him at lippert@acm.org or http://www.martinlippert.com