Explore the evolution of quantum theory applications in materials science through this award presentation by Dr. Marvin L. Cohen, recipient of the 2014 Von Hippel Award from the Materials Research Society. Delve into the historical development of atomic theory and its impact on understanding condensed matter. Discover how quantum mechanics progressed from explaining atomic spectra to tackling the complexities of solids. Examine the breakthroughs in electronic band structure calculations that revolutionized our understanding of real materials. Gain insights into the central role of quantum theory in explaining and predicting properties of semiconductors, superconductors, and nano-structured materials. Learn how these advancements have led to the discovery of new materials and shaped modern materials research.