PYTHIA 8 Authors and Contributors

Note: prospective new contributors should consult the Code contributions section on the Contact page.

Definitions of the responsibilities of Authors, Former Authors, Contributors, etc, can be found in the Guidelines for PYTHIA Authors and Contributors.


The triumvirate leadership (see the guidelines) currently consists of:

Contact information can be found below.

Current Authors

The PYTHIA 8.312 authors are:

Former authors

Stefan Ask, Jesper Roy Christiansen, Richard Corke, Nadine Fischer, Christine O. Rasmussen, Stefan Prestel.

Further Contributions

Note for prospective new contributors: see our Guidelines


Pictures of a selection of the PYTHIA collaborators, from some of our in-person meetings.

Pythia collaboration meeting, at CERN, 7 April 2017, as part of an MCnet meeting.

MCNET 2018

Left to right: Christian Bierlich, Nishita Desai, Ilkka Helenius, Torbjörn Sjöstrand, Stefan Prestel, Stephen Mrenna, Richard Field (guest), Leif Lönnblad. On screen: Nadine Fischer. Also remotely connected: Peter Skands. Missing: Philip Ilten, Christine Rasmussen.

Cake celebration in Lund on 26 March 2019, on the occasion of the Pythia 6.4 article having reached 10,000 citations in the Inspire database.

10 000 citations

Champagne celebration on the same theme, at Peter Skands' house outside Melbourne, on 10 April 2019.

Champagne in Monash

Left to right: Peter Skands, Torbjörn Sjöstrand, Stephen Mrenna.

Garden party at Peter Skands'

Left to right: Helen Brooks, Torbjörn Sjöstrand, Stephen Mrenna, Christian Bierlich, Ilkka Helenius, Peter Skands, Leif Lönnblad, Stefan Prestel, Philip Ilten, Nishita Desai, Rob Verheyen, Christian Preuss.

Participants in the first Pythia week, 8-12 April 2019, Monash University, Melbourne.

Monash meeting 2019

Front row: Ilkka Helenius, Peter Skands, Torbjörn Sjöstrand, Leif Lönnblad, Christian Preuss, Cody Duncan. Back row: Philip Ilten, Helen Brooks, Nishita Desai, Stefan Prestel, Christian Bierlich, Stephen Mrenna, Rob Verheyen.

Meeting in Oxford, 2024.

Oxford meeting 2024 Left to right: Phil Ilten, Torbjorn Sjostrand, Naomi Cooke, Javira Altmann, Christian Bierlich, Ilkka Helenius, Leif Lonnblad, Steve Mrenna.