Maciej Fijalkowski is a core developer of PyPy - a Python Interpreter and Compiler and of py.test, a popular testing tool. He has successfully completed a Summer of Code project and was contracted by merlinux (germany) for several tasks in the PyPy EU research project. He gave talks at international European and US Python community conferences. Carl Friedrich Bolz is one of the core developers of PyPy. He is studying computer science at the University of Düsseldorf. Currently he is working on his Master's thesis, which is about making PyPy as fast as possible and proving that dynamic languages can be almost as fast as static ones. In his spare time he plays the bassoon.