I study physical processes on the surfaces of the Earth, the Moon, Mars, and asteroids, mostly processes that involve water ice. Most of my time is spent on model computations, small and large, but I also carry out theoretical studies, data analysis, and field work.

Current Research Interests and Projects:

Research in the News

Selected Presentations

Ceres' Darkest Secret: Ice in Permanently Shadowed Craters
12 minute talk
Feb 2017
History of Snow and Ice on the Summits of Hawaii
Public/Outreach presentation, Hilo
Nov 2014
Theory of Ice Ages on Mars
Seminar ~1.5 hour
first version: 2007
most recent version: 2013
Lifetime of Ice on Main Belt Asteroids
Seminar based on Schorghofer, ApJ 682, 697–705 (2008) and more recent work.
most recent version: 2011
Acausal slope-area relations
12 minute presentation about a topic in quantitative geomorphology
most recent version: 2002

Code (current version)
This DOI always points to the most recent release: doi:10.5281/zenodo.592268
v1.1.2 doi:10.5281/zenodo.162490 (Oct 2016)
v1.1.1 doi:10.5281/zenodo.48851 (Apr 2016)
v1.1.0 doi:10.5281/zenodo.35566 (Dec 2015)
v1.0.1 doi:10.5281/zenodo.32616 (Oct 2015)