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Visiting Investigators

Dina Bower
Visiting Investigator
E-mail: dbower@ciw.edu
Phone: 202-478-8992

Dina Bower’s research is centered on finding and establishing reliable biosignatures in ancient rocks on Earth and other planets. She attempts to understand the role of microbes in the diagenesis of Fe-Ti-oxides by undertaking experiments that simulate diagenetic conditions. Currently, she is studying ~1.9 Ga Gunflint chert samples collected from four different sites of the Gunflint Formation.

 

Marilyn L. Fogel
Adjunct Staff Scientist
E-mail: mfogel@ciw.edu
Phone: 202-478-8981

Marilyn L. Fogel's research revolves around the stable isotopic biogeochemistry of modern and fossil ecosystems. She uses stable isotopes to trace biochemical and geochemical processes. She received a Ph.D in botany from the University of Texas at Austin, Marine Science Institute in 1977 and a BSc in biology from the Pennsylvania State University in 1973. Marilyn is now a Professor at the University of California Merced for the School of Natural Sciences. At UC Merced, Marilyn will provide leadership and support to current faculty research in biogeochemical cycling and ecological studies of past and future environments in the context of changing climate. She plans to establish a stable isotope laboratory capable of supporting research in ecology/paleoecology, biogeochemistry, and environmental sciences, which will serve as an integrator for interdisciplinary studies related to climate change, biodiversity, and sustainability sciences.

 

Marc Fries
Visiting Investigator
E-mail: mfries@ciw.edu
Phone: 202-478-7970

Marc is Raman spectroscopist with extensive experience in the mineralogy and petrography of carbonaceous materials. The central theme of his current research is studying carbon in geological systems, namely studying the formation and petrologic/chemical history of carbonaceous species as a means of describing the history of the parent rock.

 

Mihaela Glamoclija
Visiting Investigator
E-mail: mglamoclija@ciw.edu
Phone: 202-478-7970

Mihaela Glamoclija's research relates to general area of microbe-mineral interaction, utilization, and development of methods and concepts that may aid in the search, detection, and assessment of fossilized microbial life on Earth as a guide to the search for ancient life on Mars.

 

Neal Gupta
Visiting Investigator
E-mail: ngupta@ciw.edu
Phone: 202-679-4357 4017494069

Dr. Neal S. Gupta is a Research Scientist and Adj. Professor at the Dept. of Science and Technology, Center for Global Climate Change Studies, Bryant University in RI. He has a PhD from the University of Bristol, UK (2005) and postdoctoral research experience in geobiology and geochemistry (Yale University and MIT) until 2009 and was an NAI Postdoctoral Fellow from 2009-2010 here at Carnegie. He is working with various Geophysical Laboratory scientists under the supervision of Dr. George Cody, specifically on lignin biosynthesis and monomer distribution across different plant families.

 

Nicholas Holtgrewe
Visiting Investigator
E-mail: nholtgrewe@ciw.edu

Nicholas Holtgrewe joins us today from Howard University as a visiting investigator for a year.  He will be working with Alexander Goncharov on laser optics in Raman pump-probe experiments.  His other research interests include superconductors, solar power and laser optics.  

 

Daniel Hummer
Visiting Investigator
E-mail: dhummer@ciw.edu
Phone: 202-478-8987

Daniel Hummer completed his Ph.D at Penn State University specializing in mineralogy and crystallography. He is interested in the phase stability of minerals at high pressures and temperatures, and the kinetics of nucleation and crystal growth processes. He is currently working with Yingwei Fei to examine the behavior of ferric iron and other cations in the structure of magnesium silicate perovskite, and its impact on mantle properties.

 

Svetlana Kharlamova
Visiting Investigator
E-mail: skharlamova@ciw.edu
Phone: 202-478-8995

Svetlana Kharlamova is currently working on the implementation of simultaneous measurements of electrical conductivity and crystal structure at extreme conditions such as high pressures (over 2 Mbar) and various temperatures. For that she conceived and developed a procedure for nano/microscale fabrication of electrical contacts on diamond anvil surfaces for electrical measurements at high pressure using lithography method. Her project is aimed at identifying new superconducting phases.

 

Katya Klochko
Visiting Investigator
E-mail: kklochko@ciw.edu
Phone: 202-478-8916

Kateryna's research investigates the interactions of small organic molecules with mineral surfaces. She collaborates with Robert Hazen and others to explore topics related to NASA's Astrobiology program.

 

Anton Kolesnikov
Visiting Investigator
E-mail: anton.yu.kolesnikov@gmail.com

Anton Kolesnikov joins us from The Russian State University of Oil and Gas. He will be working on equation of state measurements for ethane, propane and n-Butane using Brillion scattering and Raman and IR spectroscopies up to 20 GPa and 1000 K. Anton will be working with Muhetaer Aihaiti, Maddury Somayazulu and Russell Hemley. RG31

 

Peter Lazor
Visiting Investigator
E-mail: plazor@ciw.edu

Peter Lazor collaborates with Viktor Struzhkin and others to investigate the thermal properties of materials in diamond anvil cells whilst combining laser heating and finite element analysis. He obtained a Ph.D in earth sciences in 1994 from Uppsala University, Sweden.

 

Hong Liu
Visiting Investigator
E-mail: holiu@ciw.edu
Phone: 202-478-7970

Hong Liu joins us today from the Institution of Earthquake Science as a Visiting Investigator.  She will be working with Yingwei Fei on transport properties of minerals at high pressure and temperature for one year.  She is also interested in EOS, thermodynamic properties and transport properties.  You can stop by and say hello to her in R-G31.

 

Stewart McWilliams
Visiting Investigator
E-mail: smcwilliams@ciw.edu

Stewart McWilliams is a shock-wave researcher educated at the University of California Berkeley and at Lawrence Livermore National Laboratory. He is working as a postdoc at Howard University studying high-pressure materials chemistry, transport properties, and equations of state with ultra-fast heating and measurement techniques in the diamond-anvil cell.

 

Michelle Minitti
Visiting Investigator
E-mail: mminitti@ciw.edu
Phone: 202-478-8933

Michelle joins the Geophysical Laboratory from Arizona State University. She works with Yingwei Fei on the experimental investigation of Martian interior differentiation using high-pressure experimental apparatuses to investigate variations of Martian igneous lithologies known today. Some of the lithologies include Martian meteorites, rocks measured by landed missions, and lithologies detected from orbit. Her areas of expertise include Mars Exploration, Mars chemistry and remote sensing, and meteorites. Previously, Michelle was a Faculty Research Associate at the Center For Meteorite Studies at Arizona State University.

 

Dominic Papineau
Visiting Investigator
E-mail: dpapineau@ciw.edu
Phone: 202-478-8908

Dominic Papineau's research projects are focused on the Paleoproterozoic phosphorus and nitrogen cycles, biosignatures in banded iron formations and the step-wise rise of atmospheric oxygen. He is a geochemist interested in the early evolution of life, biogeochemical cycles and biological signatures in Precambrian sedimentary rocks.

 

Dean Presnall
Visiting Investigator
E-mail: dpresnall@ciw.edu

Dean joins the Geophysical Laboratory as a visiting scientist from the University of Texas at Dallas working with Yingwei Fei. He received his B.S. from Penn State University in 1957; his M.S. from California Institute of Technology in 1959; and his Ph.D. from Penn State University in 1963. Dean's research interests include experimental igneous petrology and magmatic evolution of Earth.

 

Charles Prewitt
Senior Visiting Investigator
E-mail: cprewitt@ciw.edu

Charlie's research interests include the characterization of minerals, analogs, and new materials. His research on silicates and oxide materials, specifically, and his development of principles of ionic radii in these materials, has been highly influential in the earth and materials sciences over the past 40 years. Charlie was the Director of the Geophysical Laboratory from 1986 to 1999. For more information, please view Russell J. Hemley's talk presented at an MSA symposium in 2003 to honor Charlie's receipt of the Roebling Medal.

 

Dimitri Sverjensky
Senior Visiting Investigator
E-mail: dsverjensky@ciw.edu
Phone: 202-478-7975

Dimitri Sverjensky is a Professor of Geochemistry in the Department of Earth and Planetary Sciences at the Johns Hopkins University. Professor Sverjensky received his B. Sc. degree with First Class Honors from the University of Sydney (Australia) in 1973 and a Ph.D. from Yale University in 1980. He has worked in the fields of economic geology, isotope geochemistry and theoretical aqueous solution chemistry. In recent years, his research has focused on integrating theoretical and experimental studies of the geochemistry of the mineral-water interface, mainly with applications to environmental geochemistry and to the role of surface chemistry in the origin of life. He has been a Visiting Investigator since 2005.

 

Adrian Villegas-Jimenez
Visiting Investigator
E-mail: avjimenez@ciw.edu
Phone: 202-478-8915

Adrián Villegas-Jiménez is an experimental and theoretical geochemist who received his Ph.D from McGill University. As a Carnegie Fellow, his research explores fundamental surface and ion exchange reactions displayed by carbonate and hydroxyapatite minerals, with implications that range from the geosequestration of atmospheric carbon dioxide, calcium homeostasis and acid-base balance of human body fluids to biomineralization processes. He collaborates with Robert Hazen and Dimitri Sverjensky in this research.

 

Takamitsu Yamanaka
Senior Visiting Investigator
E-mail: tyamanaka@ciw.edu
Phone: 202-478-8940

Takamitsu Yamanaka's experimental work focuses on x-ray diffraction, absorption and resonance using synchrotron radiation. For the past 20 years he has used PF-KEK and SPring-8 in Japan. He is also Chairman of International Mineralogical Association.

 

Haiyan Zheng
Visiting Investigator
E-mail: hzheng@ciw.edu

Haiyan Zheng joins us as a visiting investigator from CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences (PR China). She is working with Malcolm Guthrie and Ho-Kwang Mao on Beam Line 3 (SNAP), SNS, at the Oak Ridge National Lab. Zheng is studying the polymerization and conductive behavior of unsaturated organic compound under high pressure.