At PNNL, our core capabilities are divided among major departments that we refer to as Directorates within the Lab, focused on a specific area of scientific research or other function, with its own leadership team and dedicated budget. Our Science & Technology directorates include National Security, Earth and Biological Sciences, Physical and Computational Sciences, and Energy and Environment. In addition, we have an Environmental Molecular Sciences Laboratory, a Department of Energy, Office of Science user facility housed on the PNNL campus. The Earth and Biological Sciences Directorate (EBSD) leads critical research in four areas: Atmospheric, Climate & Earth Sciences, Biological Sciences, Environmental Molecular Sciences, and Global Change. Our vision is to develop a predictive understanding of biological and Earth systems in transition. We aim to understand energy and material flows within the integrated Earth system; to understand, predict, and control the response of biosystems to environmental and/or genomic changes; and to model the Earth system from the subsurface to the atmosphere. Theâ¯Biological Sciences Divisionâ¯has 17 collaborative, interdisciplinary biology-based teams to tackle major challenges in ecosystem sustainability, bioenergy, human health, and national security. Teams use unique field sites, advanced instrumentation, and integrated computational approaches to explore molecular-scale processes. Strategic efforts focus on advancing molecular measurement capabilities, uncovering the structure and function of molecular dark matter, identifying control points in complex systems, and developing domain-aware AI to accelerate discovery and hypothesis-driven research. This position will support the Multiscale System Science Group's Strategic Scientific Objective on identifying control points for manipulating multiscale systems. The Soils Ecosystem Team within the Multiscale System Science Group at PNNL invites applications for a Postdoctoral Research Associate to investigate rhizosphere processes influencing methane (CHâ) dynamics in northern peatlands. The successful candidate will join an interdisciplinary team of researchers and will have access to world-class facilities and equipment hosted by PNNL. The candidate is expected to lead experiments, and participate in field sampling campaigns, and data-model integration efforts. The position is based at PNNL's Richland, WA campus with access to state-of-the-art facilities, including analytical laboratories and high-performance computing.