Mohamed Abdelaziz is a 37-year-old freelance Joomla! developer with extensive experience in developing and customizing Joomla! extensions. He has created six extensions that are listed on JED, for example, Multiple Extra Fields Groups for K2 and others. These extensions are published at www.joomreem.com.

He worked on freelancing websites from 2007 to 2011. Since then, he has completed 100 plus projects, ranging from large- to small-size development and customization jobs, with excellent reviews from most of his clients.

Prior to working as a freelance Joomla! developer, he worked as a software engineer and systems analyst for EJADA Systems (from 2002 to 2005). He participated in the analysis of the Saudi Ministry of Commerce workflow. In addition to this, he designed and developed an automated system using the Oracle database and developer to replace the manual system they had.

He graduated from Alexandria University with a BSc degree in Computer Science and Automatic Control (2000), and became a Sun Certified Programmer for the Java 2 Platform 1.4 in October 2005.

He was one of the technical reviewers of Joomla! 2.5 Beginner's Guide, Eric Tiggeler, Packt Publishing. He is also active on some of the Joomla! community forums to exchange knowledge and help other Joomla! users.

Mir Parvez Akther is a young and enthusiastic web developer who believes that nothing is impossible in the domain of programming. With an extensive eight-year work experience in web and advance-level programming, he has created a cool, applicable, and useful Joomla Template Framework, Expose. Expose has been the heart of millions of websites that run online and can be found from www.themexpert.com.

He dropped out of his undergraduate course and got involved in web development in 2006. After working on several hundred websites for clients, he bootstrapped his own start-up called ThemeXpert. ThemeXpert has more than 55,000 clients all over the world and is a renowned Template Studio for Joomla!. It also has 50 plus premium and free Joomla! templates and more than 15 extensions at the time of writing this book. Some of these Joomla! extensions are very popular in Joomla! Extension Directory (JED) and have been downloaded over 200,000 times.

Antony Doyle is a frontend developer, designer, and Joomla! specialist. He's been designing, building, and experimenting on the Web since 1998, and between 2005 and 2013, he worked almost exclusively on Joomla! as a freelance web developer.

He created SiegeEngine, the Foundation-based template framework for Joomla!, as a starting point for projects, which has since become a popular open source project in itself. While he specializes in CSS, HTML, and JavaScript, he's known to turn his hand to PHP, MySQL, .NET, and C#. Since building SiegeEngine, he's also pretty handy with the Foundation CSS framework.

Since early 2013, he is a member of the professional services team at Zengenti, working with the government, universities, and large public sector companies, and developing world-class websites on their own enterprise CMS, Contensis.

Mark Kielar brings with him over 25 years of experience in design, photography, commercial art, analysis, and computing to his understanding of open source content management systems such as Joomla! 1.6, 2.5, and 3.3. He has applied his expertise in web design and development and writing and editing projects for commercial websites and fan-type websites and blogs.

He currently operates his own web design and content management business in the San Francisco Bay Area. He has also served as a technical reviewer on Joomla! 1.6 First Look, Eric Tiggeler, Packt Publishing.

Konstantinos Manos has a PhD in Computer Science and more than 15 years of experience as a software designer and developer in companies such as SingularLogic, Addit Solutions, Innews, and Audiotex SA.

Lately, he has been working as a freelance software engineer, specializing in Internet applications and infrastructure development. Using Delphi, PHP, VB.NET, ASPX.NET, Objective-C, MySQL, and MSSQL, he combines binary applications with Internet frontends via the use of dynamic websites (AJAX), web services (XML, SOAP), or RSS feeds that create flexible, live, and robust Internet applications.

He is the co-founder of two companies, one that specializes in developing browser-based MMO strategy games and another that promotes a portal for restaurants in Greece.

Peter Martin has a keen interest in computers, programming, sharing knowledge, and how people use information technology. He has a bachelor's degree in Economics (International Marketing Management) and a master's degree in Mass Communication.

He discovered PHP/MySQL in 2003 and the predecessor of Joomla!, Mambo CMS, a year later. He has his own business at www.db8.nl (founded in 2005) and supports companies and organizations with Joomla! implementations, support, and training and custom Joomla! extension development.

He is actively involved in the Joomla! community, where he is a member of the Community Leadership Team and Global Moderator at the Joomla! forum. In his hometown, Nijmegen (the Netherlands), he organizes Open Coffee Nijmegen (a monthly networking event for small businesses and self-employed people) and Linux User Group Nijmegen.

For Packt Publishing, Peter has reviewed various books such as Joomla! 3 Beginner's Guide, Joomla! 2.5 Beginner's Guide, and Joomla! 1.6 First Look, all by Eric Tiggeler; Joomla! Search Engine Optimization, Ric Shreves; and Joomla! 1.5 Templates Cookbook, Richard Carter.

His other interests are open source software, Linux (Debian), Raspberry Pi, music (collecting vinyl records), art house movies, and trivia.