The group's principal activity is to provide system for processing scientific data. The group's Massively Parallel Quantum Chemistry (MPQC) computer software compute closed shell and general restricted open shell Hartree-Fock energies and gradients, second order open shell perturbation theory (OPT2[2]) and Z-averaged perturbation theory (ZAPT2) energies, and second order closed shell Moller-Plesset perturbation theory energies and gradients. The group operates from California, United States.