The following people represent the collaborating laboratories and institutes which provide resources to Geant4:
| Institution | Representative |
|---|---|
| CERN | R. Forty |
| ESA | P. Nieminen (Chair) |
| FNAL | D. Elvira |
| INFN | M. Paganoni |
| IN2P3 | C. Morel |
| KEK | H. Kurashige |
| LIP and TRIUMF | F. Retiere |
| LPI | V. Grichine |
| SLAC | M. Asai |
| Spain | N. Colino |
| STFC (formerly PPARC) and G4AI | J. Allison |