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M. A. Caplinger is a leading figure in planetary science and instrumentation, whose work has fundamentally shaped how we explore the surface of Mars. As a key contributor to NASA’s Mars rover missions, Caplinger’s primary research areas include the development of advanced imaging systems and spectroscopic instruments for in-situ planetary analysis. Their most significant contributions are the design and implementation of the Mars Hand Lens Imager (MAHLI) on Curiosity and the SHERLOC instrument on Perseverance. MAHLI, a focusable color camera, has provided unprecedented close-up views of Martian rocks and soil, enabling detailed stratigraphic and textural analysis (229 citations). Caplinger’s role in the SHERLOC investigation (237 citations) has been equally transformative, as this instrument uses Raman and fluorescence spectroscopy to map organic compounds and minerals, directly supporting the search for past life. Further demonstrating their impact, Caplinger led the development of the next-generation engineering cameras and microphone on Perseverance (141 citations), which have enhanced rover autonomy and public engagement. With hundreds of citations across their most influential works, Caplinger’s legacy is defined by creating the tools that allow humanity to see and understand Mars with unprecedented clarity.