Breadcrumb

Bio
I am a glaciologist, geophysicist, and photographer.
My research is focused on glacier mechanics and dynamics, and particularly on the behavior of ocean-ending glaciers and glacier contributions to sea level. I have done field research for more than 30 years in glacier regions from Alaska to Antarctica to the summit of Mt. Kilimanjaro. For about a decade starting in the late 1990s, I led the long-term study of Columbia Glacier, on Alaska’s South Central Coast, a research program started by glaciology pioneers Mark Meier (also an INSTAAR Director, from 1985 to 1994) and Austin Post. Columbia Glacier is one the world’s most extensively studied and most rapidly changing glaciers, and has been the source of many crucial insights about glacier-ocean interaction. I have served as an advisor to the United Nations Environmental Program (UNEP), the Arctic Monitoring and Assessment Program (AMAP), and was a Lead Author for Chapter 13 (Sea Level Change) in the IPCC Fifth Assessment/Working Group I (2010-2014). I also operate WT Pfeffer Geophysical Consultants, LLC, providing consulting modeling, analysis, and assessments on sea level rise and glacier-related hazards.
In addition to my scientific work, my photography has appeared in many publications in the US and Europe. I am the author of The Opening of a New Landscape: Columbia Glacier at Mid-Retreat, published by the American Geophysical Union in 2007. My most recent book, The Hand of the Small Town Builder, published by David R. Godine, was published in Spring 2014.
I also served as a 2015-16 Jefferson Science Fellow at the United States Agency for International Development (USAID) in Washington, DC.
Education
- PhD: University of Washington, 1987
- MS: University of Maine, 1981
- BS: University of Vermont, 1976
Awards
- Jefferson Science Fellow, National Academy of Sciences, 2015
- Nye Lecture, American Geophysical Union, 2011
- University of Colorado Council on Research and Creative Work, Sabbatical Year Support, 2007
Research
Specialties
Glaciology, continuum mechanics, heat transfer, analysis and numerical methods.
Research interests
Sea level rise, hydrology, natural hazards, geophysical and architectural photogrammetry, science policy.
Publications
Recent publications
Hudson Strait Quaternary sediments and late glacial and deglaciation history: A discussion and summary
Type: Chapter
Ice columns and frozen rills in a warm snowpack, Green Lakes Valley, Colorado, USA
Publication Date: 2000-01-01
Type: Journal Article
In situ stress tensor measured in an Alaskan glacier
Publication Date: 2000-01-01
Type: Journal Article
Rock glacier dynamics and paleoclimatic implications
Publication Date: 1999-12-01
Type: Journal Article
Numerical modelling of the Laurentide Ice Sheet in the Baffin Island region: the role of a Cumberland Sound ice stream
Publication Date: 1999-08-01
Type: Journal Article
Glaciology
Publication Date: 1999-07-01
Type: Journal Article
Three-dimensional deformation measured in an Alaskan glacier
Publication Date: 1998-08-28
Type: Journal Article
Response time of glaciers as a function of size and mass balance: 1. Theory
Publication Date: 1998-05-10
Type: Journal Article
Response time of glaciers as a function of size and mass balance: 2. Numerical experiments
Publication Date: 1998-05-10
Type: Journal Article
Glaciology
Publication Date: 1998-02-01
Type: Journal Article
Mapping subglacial surfaces of temperate valley glaciers by two-pass migration of a radio-echo sounding survey
Publication Date: 1998-01-01
Type: Journal Article
Crevasse patterns and the strain-rate tensor: a high-resolution comparison
Publication Date: 1998-01-01
Type: Journal Article
Formation of ice layers by infiltration and refreezing of meltwater
Publication Date: 1997-05-26
Type: Conference Proceeding
A 3-D boundary element formulation of viscoelastic media with gravity
Publication Date: 1997-03-01
Type: Journal Article
Edge function analysis of glacier mechanics problems
Publication Date: 1997-03-01
Type: Journal Article
Numerical modeling of late Glacial Laurentide advance of ice across Hudson Strait: Insights into terrestrial and marine geology, mass balance, and calving flux
Publication Date: 1997-02-01
Type: Journal Article
Reference overlooked in ''Determination of timing and location of water movement and ice-layer formation by temperature measurements in sub-freezing snow''
Publication Date: 1997-01-01
Type: Journal Article
Stress interaction between multiple crevasses in glacier ice
Publication Date: 1996-05-01
Type: Journal Article
Determination of timing and location of water movement and ice-layer formation by temperature measurements In sub-freezing snow
Publication Date: 1996-01-01
Type: Journal Article
Short wavelength variations in the horizontal velocity field of a valley glacier
Type: Chapter
A maximum resolution glacier-bed surface obtained by radio-echo sounding
Type: Chapter
THEORETICAL LIMITATIONS TO ENGLACIAL VELOCITY CALCULATIONS
Publication Date: 1994-01-01
Type: Journal Article
VARIATIONS OF NEAR-SURFACE FIRN DENSITY IN THE LOWER ACCUMULATION AREA OF THE GREENLAND ICE-SHEET, PAKITSOQ, WEST GREENLAND
Publication Date: 1994-01-01
Type: Journal Article
Meltwater refreezing in the accumulation area of the Greenland Ice Sheet, Pakitsoq region, summer 1991
Type: Chapter
Stress-induced foliation in the terminus of Variegated Glacier, Alaska, U.S.A., formed during the 1982-83 surge
Publication Date: 1992-01-01
Type: Journal Article
Pages
Teaching
Past courses
- CVEN 3698: Engineering Geology
- CVEN 4718/5718: Mechanics/Dynamics of Glaciers
- CVEN 5838: Mechanics/Dynamics of Landslides and Rockfalls
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Outreach
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