I am a research scientist in the Department of Geological Sciences specializing in laser ablation and quadrupole ICP-MS. My principal research interests lie in the fields of global change and sedimentary geochemistry as applied to modern and ancient depositional settings, and include chronostratigraphy, carbonate geochemistry, and paleoceanography. I am particularly interested in organic-rich sequences in space and time, and the impact of life processes (including anthropogenic effects) on the stratigraphic record. I utilize geochemical, isotopic, and GIS techniques, in addition to good old-fashioned field geology and petrography.

Projects of active and ongoing interest include: (1) Evaluating Neoproterozoic climate change (in Northern Ethiopia, Middle East) and its relationship to the Snowball Earth Hypothesis; (2) Discerning controls of REE distributions in organic carbon rich depositional systems; (3) Deciphering controls of microbial dolomite occurrence in organic rich depositional settings; (4) Determination of high-resolution chemostratigraphies in environmentally sensitive growth-banded sedimentary records (speleothems, microbialites, cements, cap carbonates); (5) Use of C, O, S, & Sr isotopic tracers in defining natural solute origins in the Red River system.

I have taught a diversity of Earth Science courses since 1995 and previously worked in the energy industry (ARCO/Mobil) in hydrocarbon exploration, reservoir characterization and development, and delineation of petroleum source rock systems. I currently teach courses in inorganic mass spectrometry (GEO 391, 390S).

Areas of Expertise

Sedimentary geochemistry, isotope geochemistry, Earth system evolution, Q-ICP-MS, microanalytics, GIS, Neoproterozoic climate


Research Locations



Participant, Teaching and Learning Activities in Geochemistry: Examples and Applications, Goldschmidt Workshop (2014)

Member, European Association of Geochemistry (2013 - Present)

Participant, On the Cutting Edge Workshop, Teaching Mineralogy, Petrology, and Geochemistry (2011)

Invited Facilitator, Sponsored workshop: On the Cutting Edge: Designing Innovative and Effective Courses in Geosciences, NAGT/NSF (2006 - 2007)

Member, Geological Society of America (2006 - Present)

Member, American Geophysical Union (1987 - Present)

Member, Society for Sedimentary Geology (1985 - Present)

Member, American Association of Petroleum Geologists (1985 - Present)

Invited co-keynote (with Jay Banner): Integrating Texas Speleothem Proxies Constraints from Monitoring and Imaging Studies, NSF-sponsored High Resolution Proxies of Paleoclimate workshop, University of Wisconsin-Madison (2013)

Invited keynote speaker - Expressions of Neoproterozoic Icehouse Earth in the Arabian-Nubian Shield, 33rd IGC, Oslo, Norway - August (2008)

Invited Participant/Speaker - 1st international conference on Snowball Earth, Organization name needed, Ascona, Switzerland - July (2006)

390S Analytical Methods: Quadrupole -ICP-MS (Graduate)

GEO 391 Fundamentals and Applications of ICP-MS (Graduate)