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Dan Rocheleau is a key figure in astronomical instrumentation, specializing in fiber optics for large-scale spectroscopic surveys. His work is critical to the operational success of major projects like the Sloan Digital Sky Survey (SDSS-V). Rocheleau’s major contribution lies in the practical, high-stakes engineering of fiber connection systems, most notably demonstrated in his work on the APOGEE spectrograph at Apache Point Observatory. His highly cited 2022 paper on the field retermination of MTP fiber connectors details a complex, hands-on procedure to replace worn connectors in the field, providing vital lessons on wear analysis and throughput restoration. This work directly enabled the continued performance of the APOGEE fiber train for SDSS-V, ensuring the integrity of data from thousands of stars. While his citation count (3) reflects the niche, applied nature of his research, its impact is profound: it solves a real-world bottleneck in a multi-million dollar survey. Rocheleau’s expertise in maintaining high-fiber-count connections under operational constraints makes him an unsung hero of modern astrophysical data collection.