| WP number/description | WP leader | Participating Institute |
| WP1- Management | Luigi Piro (coordinator) | INAF/Institute of Space Astrophysics and Planetology (IAPS) |
| WP2- General Networking for High Energy Astrophysics | José Miguel Torrejon | University of Alicante (UA) |
| WP3- Networking activities for High Energy Astrophysics | Stavros Katsanevas | European Gravitational Wave Observatory (EGO) |
| WP4- Public Outreach | Ioannis Georgantopoulos | National Observatory of Athens (NOA) |
| WP5-Access to experimental facilities | Salvatore Sciortino | INAF/Palermo Astronomical Observatory (OAPA) |
| WP6- Access to data analysis | Paul ‘O Brien | Leicester University (ULEIC) |
| WP7- Computational Astrophysics | Marc Audard | University of Geneva (UNIGENEVE) |
| WP8- Access to Gravitational Wave Science Archive and Tools | Stavros Katsanevas | European Gravitational Wave Observatory (EGO) |
| WP9- Tecnology and techniques for Microcalorimeters | Jan-Willem den Herder | Space Research Organisation Netherlands (NOW-I/SRON) |
| WP10- Optics for next generation X-ray Observatories | Vadim Burwitz | MPG/Max Planck Institute for Extraterrestrial Physics (MPE) |
| WP11- Space Experiments for HE Astrophysics & Multimessenger Astronomy | Lorraine Hanlon | University College Dublin (NUID UCD) |
| WP12- Multimessenger Astronomy Exploitation and Tools | Marica Branchesi | Gran Sasso Science Institute (GSSI) |
| WP13- Laboratory Astrophysics | Gabriele Betancourt | CNRS/ Institut de recherche en astrophysique et planétologie (IRAP) |
| WP14- Advanced Tools for Data Analysis | Fabrizio Fiore | INAF/Trieste Astronomical Observatory (OATs) |
| WP15- Innovation | Paolo Bastia | Thales Alenia Space Italia Spa (TAS) |
