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Giovanni Bellettini is a leading figure in fundamental physics and lunar laser ranging (LLR), whose work bridges precision metrology, general relativity, and space-based tests of new physics. His major contributions center on advancing lunar laser ranging technology to probe the foundations of gravity—including the equivalence principle and possible deviations from general relativity—while also enabling absolute positioning metrology for future lunar missions. Bellettini’s most cited paper, “MoonLIGHT: A USA–Italy lunar laser ranging retroreflector array for the 21st century” (2012, 20 citations), describes the design and deployment of a next-generation retroreflector array that dramatically improves ranging accuracy, a cornerstone for both lunar geodesy and relativistic tests. His companion work, “Probing General Relativity and New Physics with Lunar Laser Ranging” (2012, 12 citations), outlines the theoretical framework for using LLR to constrain alternative gravity theories. Additionally, his involvement with the MAGIA lunar orbiter concept (2010, 10 citations) highlights his role in integrating ranging instruments into space missions. Though his citation counts reflect a specialized but impactful niche, Bellettini’s work is pivotal for the next generation of lunar science and fundamental physics experiments.