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E. Marie Muehe was a doctoral student of Andreas Kappler in Geomicrobiology at the Eberhard-Karls-University of Tuebingen, Germany, from 2009 to 2013. Her Ph.D. was funded by the German Federal Environmental Foundation (DBU). She received her diploma in Plant Physiology at the University of Tuebingen, Germany. Her research focuses on the interactions of plants, microorganisms and minerals in arsenic- and cadmium-contaminated environments.

Andreas Kappler is Professor for Geomicrobiology at the Eberhard-Karls-University of Tuebingen, Germany, since 2008. He received his diploma in Chemistry and his Ph.D. in Environmental Microbiology at the University of Konstanz (Germany). After a postdoc at EAWAG/ETH (Zürich) in Environmental Chemistry and a postdoc at Caltech in Geobiology, he moved to Tübingen in 2004 to head an Emmy-Noether junior research group in Geomicrobiology before being appointed Professor of Geomicrobiology. His research focuses on the formation and transformation of iron minerals by Fe^II-oxidising and Fe^III-reducing bacteria and the implications of these processes for the fate of pollutants in soils and sediments as well as for the deposition of iron minerals on early Earth. His research combines microbial cultivation, molecular biology, fluorescence and electron microscopy, Mössbauer spectroscopy and synchrotron-based X-ray absorption spectroscopy and spectromicroscopy.