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Samuel Teinturier is a leading figure in planetary science, with a primary focus on the geochemical and atmospheric evolution of Mars. His most impactful contributions stem from his integral role in the Sample Analysis at Mars (SAM) investigation, part of the Mars Science Laboratory (MSL) mission. As detailed in his highly cited 2012 paper (563 citations), Teinturier helped design and implement the suite of instruments that analyze the chemical and isotopic composition of the Martian atmosphere and volatiles extracted from solid samples. This work has been fundamental in quantitatively assessing the planet’s past habitability, revealing key insights into the cycling of carbon, sulfur, and water. By enabling precise measurements of noble gases and light isotopes, his research has directly shaped our understanding of how Mars lost its thick atmosphere and transitioned from a potentially wetter world to its current arid state. Teinturier’s achievements are not merely technical; they are foundational to the mission’s overarching goal of deciphering whether Mars ever supported life.