Dear All, We are happy to announce the 12th Annual BerkeleyGW Tutorial Workshop and the 7th Berkeley Excited States Conference (BESC2026), August 17 - 21, 2026, in Berkeley, California, USA. The events will be held in person (with an option for virtual attendance). The BerkeleyGW Tutorial Workshop (Aug. 17 - 19) includes lectures and hands-on tutorial sessions on the GW and GW Bethe-Salpeter equation (GW-BSE) approaches using the latest version of BerkeleyGW package (v4.0). The Workshop will cover theories of GW, GW-BSE, GW perturbation theory (GWPT), and time-dependent GW (TDGW) methods and beyond, standard and new features of BerkeleyGW, and detailed examples of using the BerkeleyGW in conjunction with various DFT packages. Training accounts will be available for the hands-on sessions, in-person attendees will receive priority. In tandem with the annual BerkeleyGW Workshop, we will host the 7th Berkeley Excited States Conference (BESC2026) (Aug. 20 - 21). BESC2026 will be a general topical conference with mainly invited talks by experts on recent progress in the theory and applications of ab initio study of quantum many-body effects as well as experiments in excited-state phenomena in materials, showcasing forefront research that involves advanced many-body approaches (e.g., GW, GW-BSE & beyond, DMFT, quantum Monte Carlo, TDDFT, TDGW, etc.), novel experiments, and new science in the excited states. Both events are sponsored by the US Department of Energy’s Center for Computational Study of Excited-State Phenomena in Energy Materials (C2SEPEM). Further information, along with the registration link (with no registration fee), is available at: https://urldefense.com/v3/__https://workshop.berkeleygw.org/__;!!LIr3w8kk_Xxm!qbiNwYd4Gbl6YtnuiRRasWgm2JKDly9EYQx5nRNe-i8hoCYKrzul3ur3ubYR0fxAufJekI3nvw4WD9XSBTcDnJ7tVY1gT9NSsg$ Best regards, The organizing committee Steven G. Louie, Chair (UC Berkeley and LBNL) Mauro Del Ben (LBNL) Jack R. Deslippe (LBNL) Felipe H. da Jornada (Stanford University) Zhenglu Li (University of Southern California) Jeffrey B. Neaton (UC Berkeley and LBNL) Diana Y. Qiu (Yale University) David A. Strubbe (UC Merced)