Explore cutting-edge research on correlated electron materials in this 43-minute lecture presented by Garnet Chan from the California Institute of Technology at IPAM's Model Reduction in Quantum Mechanics Workshop. Delve into the characterization of properties in materials like cuprates using low energy models and all-electron ab initio calculations. Gain insights into the work conducted by Chan's research group and collaborators in the field of quantum mechanics and materials science. Recorded on April 11, 2022, this talk offers a comprehensive look at the intersection of lattice models and ab initio descriptions in the study of correlated materials.