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E. Carrasco is a key figure in astronomical instrumentation, specializing in the design, assembly, and precision alignment of fiber-optic systems for major ground-based observatories. Their primary contributions center on MEGARA, the powerful optical integral field unit (IFU) and multi-object spectrograph for the 10.4-meter Gran Telescopio Canarias (GTC). Carrasco led critical work on the instrument’s high-precision gluing of fibers and microlenses, ensuring optimal light feed, and developed sophisticated sub-aperture stitching interferometry to test large optical surfaces. They also played a central role in the final assembly and metrology of the WEAVE fiber positioner for the William Herschel Telescope, a system responsible for accurately placing 960 fibers. While individual paper citation counts (ranging from 3 to 23) reflect the specialized nature of instrumentation work, the impact of Carrasco’s contributions is immense: MEGARA and WEAVE are workhorse facilities enabling thousands of scientific studies. Their expertise in transforming complex optical requirements into robust, high-precision hardware has been essential to the success of these flagship instruments, directly empowering discoveries in galactic evolution, stellar populations, and cosmology.