Aatos Heikkinen is an experimental high-energy physicist at the Helsinki Institute of Physics.  He has graduated in Computational Physics from the University of Helsinki.  He is a member of the Compact Muon Solenoid collaboration, where he has developed software for detector simulation, and multivariate data analysis using neural networks.  Aatos is a member of the Geant4 collaboration, where he has specialized to modeling of intra-nuclear cascades, and acted as a Geant4 Hadronic Physics Group coordinator.