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P. Pasquier is a leading planetary seismologist whose work has fundamentally advanced our understanding of the interior structure of Mars. As a key contributor to NASA’s InSight mission, Pasquier’s research centers on the deployment and analysis of seismic data to unravel the Red Planet’s crust, mantle, and core. Their most-cited work, the 2019 paper "SEIS: Insight’s Seismic Experiment for Internal Structure of Mars" (375 citations), details the development and deployment of the SEIS instrument—a sophisticated six-axes seismometer that marked the first successful seismic station on Mars since the Viking landers over 40 years earlier. This instrument, equipped with a long-period Very Broad Band (VBB) sensor, has revolutionized Martian geophysics by enabling the detection of marsquakes and meteorite impacts. Pasquier’s contributions have been instrumental in mapping Mars’ internal layering, revealing a surprisingly thin crust and a liquid core. Their work not only provides critical constraints on planetary formation and evolution but also sets the stage for future geophysical exploration of other worlds. For students and researchers, Pasquier exemplifies how innovative instrumentation and rigorous data analysis can unlock the secrets of a planet’s deep interior.