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About

John Roll is an instrumental astronomer and engineer whose career has been defined by the design, construction, and deployment of advanced multi-object spectrographs at the MMT Observatory on Mount Hopkins, Arizona. His most celebrated contribution is the Hectospec, a 300 optical fiber-fed spectrograph commissioned at the MMT in 2004, which revolutionized wide-field spectroscopic surveys by enabling simultaneous observation of hundreds of objects. The instrument's innovative robotic fiber positioner — a pair of high-speed six-axis robots capable of repositioning 300 fiber buttons within roughly 300 seconds to an accuracy of 25 microns — represented a major engineering achievement in astronomical instrumentation. With 382 citations, the Hectospec commissioning paper stands as a landmark reference in observational astronomy. Roll further expanded this legacy with the Hectochelle, a multiobject echelle spectrograph sharing Hectospec's robotic positioner infrastructure, and contributed foundational work on targeting and sequencing algorithms essential to efficient fiber allocation. His earlier construction papers and contributions to the MMT's f/5 wide-field optical system collectively underscore a career devoted to pushing the boundaries of multiplexed spectroscopy, enabling transformative large-scale surveys of galaxies, stars, and cosmic structure.