Chris Hartjes has been building web applications of all shapes and sizes since 1998, ranging from catalogs of CD compilations for professional DJ's to high-traffic portal pages for large US cable television providers.

Chris gives back to the programming communities that have helped him by mentoring, speaking at conferences, and by co-organizing the TrueNorthPHP conference. As the author of multiple books on writing testable PHP code and using testing tools, he believes that testing and automation are secret weapons that organizations can use to deliver high-quality applications quickly.

Monday through Thursday he works from his basement office in the snowy wilds of Canada as a Senior QA Engineer for Mozilla, on Fridays he works on expanding his Grumpy Learning empire, and with whatever time he has left he does performance art on Twitter as @grmpyprogrammer.

In his role as Training Manager at Inviqa and Sensio Labs UK, Ciaran helps teams at all levels of ability improve via training and coaching. He has been a PHP professional since the late 90s and is passionate about TDD, BDD and Agile methodologies. He is lead maintainer of PhpSpec.

Derick Rethans is a PHP internals expert, author of Xdebug and an OpenStreetMap and mapping enthusiast. He has contributed in a number of ways to the PHP project, including the Xdebug debugging tool, and various extensions and additions. He's a frequent lecturer at conferences, the author of php|architect's Guide to Date and Time Programming, and the co-author of PHP 5 Power Programming. He is now working at MongoDB to work on the PHP and HHVM drivers for MongoDB.

Gojko Adzic is a strategic software delivery consultant who works with ambitious teams to align software delivery with business goals, and improve the quality of their software products and processes. Gojko specialises in are agile and lean quality improvement, in particular impact mapping, agile testing, specification by example and behaviour driven development. Gojko’s book Specification by Example won the Jolt Award for the best book of 2012. In 2011, he was voted by peers as the most influential agile testing professional, and his blog won the UK Agile Award for the best online publication in 2010. Gojko is a frequentkeynote speaker at leading software development conferences, and one of the authors of MindMup.

Marco "Ocramius" Pivetta is a software consultant at Roave.With over a decade of experience with PHP, he is part of the Zend Framework CR team, Doctrine core team, and is also active in the community as a mentor and supporter.When not coding for work, he usually hacks together new concepts and open source libraries, or simply provides Q&A on IRC.

Michelangelo van Dam works at in2it as a professional PHP consultant assisting businesses to automate their development processes, improve their code quality and train their development teams. Michelangelo is also president of the PHP user group PHPBenelux where he and a team organizes monthly meetups, development events and an annual conference. He's a devoted member of the global PHP community and contributes to open-source projects, mainly PHP related.

Author of "Build APIs You Wont Hate" and engineer at @Ride. Lots of experience in the world of open-source through projects like CodeIgniter, PyroCMS, FuelPHP, PHP-FIG and The League of Extraordinary Packages.

A graduated Computer Engineer, Rafael Dohms has vast experience in the PHP ecosystem as a Developer, Speaker and Contributor. Addicted in building communities he has founded various groups where ever he lives, currently he is to blame for AmsterdamPHP. Developer by career but teacher by vocation he travels the world sharing interest in quality code, innovation and building careers. In his free time you will likely find him gaming or contributing to open source projects.

His contribution hit list includes many projects, from PHP itself to frameworks like Symfony, Zend and projects such as Doctrine and Composer. His hobby is mentoring new Speakers that eventually take speaking slots away from him in future events, a strategy he still thinks is not very smart. Not one to listen to himself he keeps mentoring and suggesting developers everywhere create their own User Groups to grow their networks and knowledge.

Sebastian Bergmann has instrumentally contributed to tranforming PHP into a reliable platform for large-scale, critical projects. Enterprises and PHP developers around the world benefit from the tools that he has developed and the experience he shares.