Roger L. Nielsen is a Professor of Geosciences at Oregon State University. He joined the faculty of the Oregon State University College of Oceanography in 1988 as a Research Associate. In 1991 he became an Associate Professor in the College of Oceanic and Atmospheric Sciences and was promoted to Professor in 2000, at which time he also became Director of the Geology Program in the Geosciences Department. From 2003 until 2008, Nielsen servied a Chair of the Geosciences Department.
Nielsen specializes in igneous petrology, analytic geochemistry, trace element modeling, phase equilibria, and electron microprobe analysis. His research interests include computer modeling of the crystallization of magma within volcanoes; measurement of trace metals in crystals and liquids formed during experimental melting and crystallization of volcanic rocks; and the study of natural inclusions of magma within crystals.
Nielsen has developed and taught various undergraduate and graduate courses in mineralogy, petrology, igneous petrology and petrography, microprobe analysis, geosciences communication, and the geology of Oregon.
He earned BS (1976) and MS (1978) degrees in Geology at the University of Arizona and a Ph.D. in Geology from Southern Methodist University in 1983.
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