Holger Krekel is active in the Python community since 2002. He has given numerous talks including a keynote at EP2013 on "the return of P2P computing" and many trainings on automated testing and packaging. He is a co-founder of the PyPy project and maintains many well-known tools such as tox, pytest and devpi in the Python tooling landscape. His recent technical interests include the building of decentralized and crypto systems.