Emil Atanasov is an IT consultant who has strong experience with mobile technologies. He is doing his MSc at RWTH Aachen University, Germany. He has worked for several huge USA companies and has been a freelancer for years. He has experience in software design and development, and personally, he has worked on the improvement of many mobile apps. At the moment, he is focused on the rapidly developing mobile sector.

As an Android team leader and senior developer, Emil was leading a team that was developing a part of the Nook Color firmware. This was an e-magazine/e-book reader, which supports the proprietary Barnes & Nobel and many other e-book formats.

Many of the apps that Emil has designed are using Flurry API to track different users' statistics. Based on this experience, he is one of the people behind the Getting Started with Flurry Analytics book.

Christine M. Gerpheide is a software development engineer at Amazon Web Services. She completed her master's in computer science and engineering with honors from Eindhoven University of Technology in the Netherlands, before which she worked in Greece as a web developer. During her career, Christine has worked on a wide range of software, including service-oriented architectures, model-driven engineering, and mobile development. During her free time, she hikes, runs, and plays violin. Other books reviewed by Christine include TYPO3 Templates by Packt Publishing, and she has presented at a number of scientific and open source conferences.