led to the creation of the field of surface calculations of electronic structure using the invention of the supercell. This was followed by the development of a total energy scheme which initiated a new era of first principles predictions of structural, vibrational, and high-pressure properties of solids using only atomic numbers and atomic masses as input. For superconductivity, there were successes in the prediction of superconductivity in doped semiconductors, the prediction of the first superconducting oxide, and the confirmation of the ab initio proposed existence of two new high-pressure phases of silicon and their properties including the successful prediction of their superconducting properties. In the area of nanostructures, it was shown that the methods used for calculating bulk and surfaces properties were applicable for studies of nanoscale materials such as C60, nanotubes, and other low dimensional structures. These studies led to the successful prediction of the existence the BN nanotube and its properties. Seminal studies were done explaining and predicting properties of graphene nanoribbons and their energy gaps, and the properties of layered systems of graphene and BN sheets were calculated suggesting a path for fabrication of useful electronic materials. The first theoretical and experimental studies of the electronic and vibrational properties of one-dimensional isolated chains were done, and the underlying physics was determined for controlling the size and shape of 2D nanopores with applications for DNA sequencing, sieving, and quantum emission. Another nanoscience contribution was an important study of the physics of metallic clusters using electronic energies to explain their size abundances, referred to as “magic numbers” The methods developed for the above studies are numerous. Some examples include the Empirical Pseudopotential Method, ab initio pseudopotentials, supercells for surfaces and localized configurations, a method for calculating the total energy of solids, the creation of an empirical formula used to obtain the bulk moduli of many semiconductors and insulators, and the development of a method for calculating electron-phonon interactions using Wannier functions. These approaches and others first developed for this research are now used worldwide. Selected journal articles Erratum: Erratum: Erratum: Selected books and book chapters M. L. Cohen, "Superconductivity in low-carrier-density systems: Degenerate semiconductors," in Superconductivity, ed. R. D. Parks. New York: Marcel Dekker, Inc., 1969. p. 615. M. L. Cohen and V. Heine, "The fitting of pseudopotentials to experimental data and their subsequent application," in Solid State Physics, Vol. 24, eds. H. Ehrenreich, F. Seitz, and D. Turnbull.