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.