Arnaud Coomans is a senior iOS engineer. He has developed various applications, both for iPhone and iPad, and regularly contributes to open source projects. He enjoys reverse engineering, writing libraries, and writing Xcode plugins.

After working for different startups, including his own, Arnaud Coomans is now working on mobile applications for one of the biggest companies in Silicon Valley.

Jayant C. Varma is an Australian author, developer trainer, and consultant with a special focus on mobile development and the use of mobile applications in business. He is the author of the book Learn Lua for iOS Game Development, Apress, and is the Principal Consultant at OZ Apps, a company he founded, specializing in mobile business solutions.

He has been in the IT industry for quite a while and has seen things change from 8-bit computers to 64-bit mobile devices. He has been drawn towards new technology and Usable UI (user friendly and appealing). He has had several roles earlier that have seen him in different countries as the IT Manager for BMW dealerships working on wireless diagnostics and contactless key readers, among other things, to lecturing at the James Cook University and being actively involved with training and workshops for the Apple University Consortium (AUC) and Australian Computer Society (ACS). Among the well-known apps that he, as a developer, has created is the text-based adventure, Z-Day Survival Simulator application.

He has been a reviewer on a couple of Packt Publishing books based on iOS usage and development. He runs a few blogs on development, such as http://howto.oz-apps.com and http://LearnLua.oz-apps.com, among others.

Dmitry Volevodz is an experienced iOS developer. He has been doing freelance software development for a few years, but has now settled in a small company. He does enterprise iOS development, and game development is his hobby. He has written iOS 7 Game Development, Packt Publishing, a title about game development with Sprite Kit.