Paul Rulis is a computational condensed matter materials physicist at the University of Missouri - Kansas City and he is the lead principle investigator (PI) of the Computational Physics Group (CPG). Paul Rulis specializes in density functional theory based electronic structure method development and is the lead developer of the orthogonalized linear combination of atomic orbitals (OLCAO) method. The OLCAO method uses a basis of localized atomic orbitals combined with periodic boundary conditions. Paul Rulis and the CPG work on a wide variety of materials including amorphous molecular solids, Xenes, biomolecules, laser host crystals, ceramics, nanostructural materials, etc.