Pierre Lefebvre

Dr. Pierre Lefebvre is a Lecturer in the Department of Environmental Systems Science at ETH Zurich, Switzerland. His research focuses on geochemical processes governing the behavior of trace elements and radionuclides in natural and contaminated environments, with an emphasis on uranium cycling, redox dynamics, and sediment-organic matter interactions. He investigates long-term environmental evolution using multi-proxy approaches, including isotope geochemistry and mineralogical analysis.

Key research interests include: (1) redox-driven transformations of metal(loid)s in sediments and soils, (2) uranium speciation and mobility in aquatic systems, (3) climate impacts on geochemical cycles, and (4) application of isotope fingerprinting for contaminant source tracing. His work integrates field studies, laboratory experiments, and computational modeling to understand elemental cycling across diverse ecosystems like alpine lakes, tropical lagoons, and mining-impacted wetlands.

Publications highlight contributions to understanding uranium-silica polymer formation, diagenetic processes over millennia, and metal partitioning in ultramafic-derived sediments. Research spans environmental forensics, paleoenvironmental reconstruction, and biogeochemical feedback mechanisms under changing redox conditions.