Christoph Deil

I'm a data scientist at HeidelbergCement, working on machine learning projects and creating a modern data platform on Azure. Co-organiser of PyData Heidelberg. PhD in astrophysics and 10 years experience in data management and analysis software development in large scientific collaborations for the H.E.S.S. and CTA gamma-ray telescopes.

You can contact me via, LinkedIn or Twitter.

As an astrophysics researcher and scientific software developer working at the Max-Planck-Institute for Nuclear Physics in Heidelberg, Germany, I used to be very active on GitHub. Now since January 2020, my projects are internal to HeidelbergCement, so the rest of this webpage just summarises my previous work up to Dec 2019.


I've mainly worked on codes for gamma-ray astronomy data analysis and modeling. First in C++ for a few years, and in recent years mostly in Python. I started and now co-lead the development of Gammapy, a prototype for the Cherenkov Telescope Array science tools. I've contributed to several other open source projects such as astropy, regions, astroplan, hips, iminuit or


Until recently, ground-based gamma-ray astronomy was done with private data and code, internal to the collaborations that built the telescopes. I started the gamma-astro-data-formats project to create an open data model and format for high-level gamma-ray astronomy data, and lead the task group in H.E.S.S. to export the data into this standard format, resulting in the H.E.S.S. first data release and the first reproducible multi-mission analysis of a gamma-ray source, the joint Crab paper.

I continue this effort to transition to open data and tools in gamma-ray astronomy through my work in H.E.S.S. and CTA, and by organising workshops that include the larger astronomical community: PyGamma15 and PyGamma19.


My scientific focus is the study of the population of cosmic accelerators in the Milky Way. I lead the analysis and modeling of the data from the H.E.S.S. Galactic plane survey, resulting in the first survey maps and source catalog in very high energy gamma-ray astronomy. I'm now continuing this work, by including data from the Fermi Gamma-Ray Space Telescope, and via simulations for the Galactic plane survey key science program of the Cherenkov Telescope Array.

Talks and Tutorials

I have given many talks about gamma-ray astronomy, as well as talks and tutorials on Python. Below a few examples where the materials are online. If you're looking for a speaker or teacher for Python, feel free to contact me.