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Understanding the composition, structure and evolution of the Earth and the other terrestrial planets are dominant themes of my research. My expertise is in using laser ablation systems and plasma mass spectrometers for the chemical and isotopic analyses of samples. I also work with modeling and detecting the electron antineutrino flux from the Earth and nuclear reactors. With my students we provide chemical and isotopic data that constrain geological processes and data for forensics, nuclear chemistry and archaeology.