Together with my colleagues Axel Klawonn, Martin Lanser (Universität zu Köln), Oliver Rheinbach (Technische Universität Bergakademie Freiberg), and Ichitaro Yamazaki (Sandia National Laboratories) I am co-organizing the mini-symposium MS9 Domain Decomposition Methods – Parallel Algorithms, Software, and Machine Learning at the SIAM PP22 with three sessions: I, II, and III.