Jacob Mumm is a web developer from Upstate New York specializing in PHP and JavaScript web applications. He has worked for non-profit organizations, advertising companies, and schools using tools such as Drupal, jQuery (including UI and Mobile), AngularJS, and the Yii Framework. His interests range from outdoor activities such as hiking, camping, and kayaking, to organic food and gardening as part of a holistic, sustainable lifestyle, all the while staying up to date with the latest gadgets, gizmos, and web application technologies.

One of the things he deeply enjoys is talking to people about the things for which he has the most passion. He likes to share his knowledge and experience with others. Even when incomplete, Jacob finds the act of consolidating his thoughts on a subject a great way to solidify his own understanding or to discover places where he needs to investigate further.

Mark Safronov is a professional web application developer from the Russian Federation with experience and interest in a wide range of programming languages and technologies. He has built and participated in building different types of web applications, from purely computational ones to full-blown e-commerce sites. He is also a proponent of following the current best practices for test-first development and clean and maintainable code.

He is currently employed at Clevertech, and is working on Yii-based PHP web applications and maintaining a quite popular YiiBooster open source extension.

Back in 2008, he translated the book Visual Prolog 7.1 for Tyros by Eduardo Costa in to Russian.