It is our pleasure to hereby invite the community to take part in the OPERA-2020 symposium on modern theoretical and computational chemistry to be held from 31 August to 02 September 2022 (rescheduled due to COVID19). Set on the scenic banks of the Rhine river in Rhineland-Palatinate, Germany, the symposium will feature a diverse list of distinguished speakers from all over the world which will convene to celebrate the 60th birthday of Prof. Jürgen Gauss of the Johannes-Gutenberg University Mainz. A special issue of Molecular Physics commemorating the occasion will accompany the symposium.

Organisers:

• Prof. Thomas Jagau (Katholieke Universiteit Leuven, Belgium)

• Dr. Stella Stopkowicz (Johannes Gutenberg University Mainz, Germany)

• Dr. Janus Juul Eriksen (Technical University of Denmark, Denmark)

Local organiser:

• Prof. Gregor Diezemann (Johannes Gutenberg University Mainz, Germany)

• Bettina Sander, Peter Sigl, Marco Oestereich, Marios-Petros Kitsaras, Laura Grazioli, Jonas Greiner, Simon Blaschke, Sophia Burger, Florian Mast, Jeremias Oswald (Johannes Gutenberg University Mainz, Germany)

International advisory board:

• Prof. Andreas Köhn (University of Stuttgart, Germany)

• Prof. Christian Ochsenfeld (Ludwig Maximilian University Munich, Germany)

• Prof. Trygve Helgaker (University of Oslo, Norway)