USGS Scientists and Staff
Co-Director

Warren Day
Field Geology, Regional Tectonics, Structural Geology, Petrology, Economic Geology
wday@usgs.gov
303-236-6484
(Affiliate Faculty in the Department of Geology and Geological Engineering)
Scientists

Eric Anderson
Geophysics, Aeromagnetic Data, Spatial Data Analysis, Mineral Deposits, Alaska Geology
ericanderson@usgs.gov
303-236-5652
(External Joint Appointee in the Department of Geology and Geological Engineering)

Jonathan Caine
Structural Geology, Tectonics, Hydrogeology, Field Mapping
jscaine@usgs.gov
303-236-1822

Kate Campbell-Hay
Microbial and Abiotic Metal Redox Cycling, Mineralogy
kcampbell@usgs.gov
303-541-3035

Thomas Chapin
Biogeochemical Cycling in Acid Rock Drainage Systems
tchapin@usgs.gov
303-236-3200

LaDonna Choate
Toxicity of Mine Waste, Geochemistry
lchoate@usgs.gov
303-236-1241

Timothy S. Collett
Unconventional Natural Gas Resources, Gas Hydrates, Marine Geology, Geophysics
tcollett@usgs.gov
303-236-5731
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Warren Day
Field Geology, Regional Tectonics, Structural Geology, Petrology, Economic Geology
wday@usgs.gov
303-236-6484
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Geoffrey S. Ellis
Organic Geochemistry
gsellis@usgs.gov
303-236-5762
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Matthew P. Emmons
Stable Isotope Geochemistry
memmons@usgs.gov
303-236-6259
(External Joint Appointee in the Department of Geology and Geological Engineering)

Poul Emsbo
Economic Geology, Carlin Deposits, Sedimentary Copper Deposits, Phosphorite REE Deposits, Isotope Geochemistry
pemsbo@usgs.gov
303-236-1113
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Garth Graham
Hyperspectral Surveying, Alaska Geology
ggraham@usgs.gov
303-236-1558

Tien Grauch
Geophysics, Midcontinent Rift Geology, Rio Grande Rift Geology
tien@usgs.gov
303-236-1393
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Seth S. Haines
Geophysics, Gas Hydrates
shaines@usgs.gov
303-236-5709
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Albert H. Hofstra
Economic Geology, Carlin Deposits, IOA-IOCG Deposits, Melt and Fluid Inclusions
ahofstra@usgs.gov
303-236-5530
(Affiliate Faculty in the Department of Geology and Geological Engineering)

JoAnn Holloway
Watershed Biogeochemistry, Hydrothermal Geochemistry, Hg Biogeochemistry
jholloway@usgs.gov
303-236-2449

Chris Holm-Denoma
Structural Geology, Tectonics, Field Mapping, In Situ Geochronology (SHRIMP and LA-ICP-MS), Trace Element Geochemistry, Carlin Deposits
cholm-denoma@usgs.gov
303-236-5454

Andy Hunt
Noble Gas Geochemistry, Gas Geochemistry, Geothermal Systems
ahunt@usgs.gov
303-236-4931

Karen Duttweiler Kelley
Economic Geology, Exploration Geochemistry, Alkalic-Related Epithermal Deposits, Sediment-Hosted Pb-Zn Deposits, Alaska Geology
kdkelley@usgs.gov
303-236-2467
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Raymond Kokaly
Remote Sensing, Hyperspectral Spectroscopy
raymond@usgs.gov
720-352-7414

Andrew H. Manning
Metal Transport in Groundwater, Noble Gas Geochemistry, Hydrothermal Geochemistry
amanning@usgs.gov
303-236-1812

Erin Marsh
Fluid Inclusions, Mineral Chemistry
emarsh@usgs.gov
303-236-2473

Jeff Mauk
Epithermal Systems, Geothermal Systems, Mineralogy, Geochronology
jmauk@usgs.gov
303-236-5605
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Chris Mills
Surface Geochemistry, Metal Transport in Surface Waters
cmills@usgs.gov
303-236-5529

Jean M. Morrison
Surface and Soil Geochemistry, Metal Transport in Surface Waters
jmorrison@usgs.gov
303-236-6366

Leah E. Morgan
Ar/Ar Geochronology
lemorgan@usgs.gov
303-236-4729
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Chris Moses
Science Policy, Geomorphology of Carbonate Systems, Stable Isotope Geochemistry
cmoses@usgs.gov
303-236-1800

William I. Ridley
Igneous Petrology, Volcanology, Mineralogy
iridley@usgs.gov
303-236-5558
(Affiliate Faculty in the Department of Geology and Geological Engineering)

Kate Souders
Isotope Geochemistry, Igneous Petrology, Geochronology, Metamorphic Petrology
asouders@usgs.gov
303-236-9374

Cliff Taylor
REE Deposits, Banded Iron Ores, Volcanogenic Massive Sulfide Deposits, Sediment-Hosted Copper Deposits
ctaylor@usgs.gov
303-236-2499

Ryan Taylor
Economic Geology, Orogenic Gold, Porphyry Cu-Mo-Au, Mineral Chemistry
rtaylor@usgs.gov
303-236-1882

Phil Verplanck
Critical Element Resources, Carbonatite and Alkaline Intrusive-Related REE Deposits
plv@usgs.gov
303-236-1902

Richard Wanty
Environmental Geochemistry, Geochemistry of Non-Traditional Stable Isotopes
rwanty@usgs.gov
303-236-1819
(Research Professor in the Department of Geology and Geological Engineering)

Douglas Yager
Volcanology, Abandoned Mine Lands, San Juan Mountain Regional Geology
dyager@usgs.gov
303-236-2487