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S. Bailey and C. Baltay have made foundational contributions to observational cosmology, particularly in the study of dark energy through large-scale structure surveys. Their most cited work, "The BigBOSS Experiment" (2011, 80 citations), outlines a Stage IV ground-based initiative to map baryon acoustic oscillations (BAO) and cosmic growth across 14,000 square degrees using a wide-area galaxy and quasar redshift survey. This project, conditionally accepted by NOAO, represents a major leap in precision cosmology, enabling measurements of the universe's expansion history with unprecedented accuracy. Bailey and Baltay’s efforts have been instrumental in designing and advocating for next-generation spectroscopic instruments, directly shaping the Dark Energy Spectroscopic Instrument (DESI) that succeeded BigBOSS. Their research bridges theoretical predictions and observational constraints, providing critical data on dark energy's influence on structure formation. With over 80 citations on this flagship paper alone, their work continues to guide students and researchers exploring BAO, redshift-space distortions, and the evolution of cosmic voids. Their legacy lies in advancing the tools and methodologies that define modern dark energy science.