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.