"The glacier - rock glacier continuum," CSU Geology departmental seminar, November 2018
"Alpine ice on Earth: Glaicers and their rocky cousins," CU Astronomy departmental seminar, November 27, 2017
"From pure ice to rock-covered ice: the glacier-rock glacier continuum," UWashington Department of Geosciences colloquium, November 2, 2017
"Hillslopes," UWashington Department of Geosciences colloquium, November 3, 2017
"Hills and their evolution: Involving parabolas, exponentials, and hyperbolas," Applied Math, °ÄÃÅ¿ª½±½á¹û2023¿ª½±¼Ç¼, April 14, 2017
"Hillslopes of Colorado’s Front Range: From frost to trees to gophers to boulders," Potsdam, Germany, January 10, 2017
"Mountains Glaciers and Gold," Breckenridge, November 16, 2016
"Mountains Glaciers and Gold," Fairplay, November 15, 2016
"Evolution of the Colorado Front Range and the relevance of the 2013 storm," Phi Beta Kappa of Colorado, November 12, 2016
"From pure ice to rock-covered ice: the glacier-rock glacier continuum," Crowell Lecture Series, UC Santa Barbara Department of Geosciences, November 2, 2017
"Climate change in our backyard series: Glaciers and rock glaciers in Colorado’s mountains," Fiske planetarium, November 18, 2016
"Dirty Glaciers," INSTAAR, °ÄÃÅ¿ª½±½á¹û2023¿ª½±¼Ç¼, February 3, 2015
"Edges and blocks matter on hillslopes, rivers, and glacial landscapes," INSTAAR, °ÄÃÅ¿ª½±½á¹û2023¿ª½±¼Ç¼, December 2014
"Glacial modification of landscapes: From far-flung moraines to roche moutonnee," University of Iowa, October 23, 2012
"Glaciers and the landscapes they modify: Lessons from the Kennicott Glacier, Alaska," Wrangell Mountain Center talk series, McCarthy, Alaska, June 2012
"Glaciers and glacial landscapes: from natural to numerical experiments," U. Texas Austin February 2012
"Edges matter: Erosion of landscapes by migration of edges," INSTAAR, °ÄÃÅ¿ª½±½á¹û2023¿ª½±¼Ç¼, April 2012
"Of ice-water interactions in Arctic and alpine landscapes: Rapid Arctic coastline erosion and the sliding of glaciers," Caltech, January 2011
"Dominance of thermal processes and their likely acceleration along Alaska's Beaufort Sea coast," National Park Service webinar July 20, 2011
"Glaciers and glacial landscapes," Kennicott Seminar series, Wrangell Mountains and St Elias National Park, June 2010
National Snow and Ice Data Center (NSIDC) February 2009, University of Montana September 2009, Five College Lecture series, Amherst, October 2009
Yosemite Fund, March 2008; Yale, October 2008
INSTAAR, February 2007; Workshop on Climate and Geomorphology, NCAR October 2007
University of New Mexico, 10 February 2006; Wrangell-St. Elias National Park, July 2006; INQUA conference on mountain glaciers, September 2006; Garry Clarke conference, UBC, December 2006
University of Memphis, March 2005; UC Davis, April 2005; EGU, April 2005; India Geological Society, May 2005; CU INSTAAR Mountain Research Station, June 2005; CU Geology, September 2005; Rocky Mountain National Park, September 2005; NSF Earth Science Day, September 2005; University of Michigan, November 2005
Colorado School of Mines, April 2004; Colorado State University, April 2004; Yosemite National Park, June 2004
Stanford, January 2003, Penrose conference Taiwan January 2003, University of Colorado January 2003, Purdue February 2003, UC Santa Barbara February 2003
University of Wyoming January 2002, University of Colorado January 2002, Colorado College April 2002, University of Nebraska Lincoln September 2002, 'Year of the Mountain symposium,' University of Colorado November 2002, Gilbert Club December 2002
USGS Marine Geology February 2001, University of Arizona February 2001, Duke November 2001, MIT November 2001, INSTAAR December 2001
UC Santa Barbara February 2000; Caltech February 2000
William and Mary March 1999; Arizona State April 1999
UC Davis January 1998; University of Alaska Fairbanks June 1998; University of Oregon October 1998
Scripps. January 1997; USC. January 1997; Harvard. March 1997
Stanford. May 1996; UC Riverside. April 1996; Penn State. April 1996; U. Washington. May 1996
University of Wyoming. February 1995; University of California Santa Barbara. March 1995; Franklin and Marshall College. October 1995; Penn State. October 1995; Lehigh University. October 1995
Caltech. February 1994; Stanford. March 1994; UC Berkeley. March 1994; MIT. March 1994; Oregon State. April 1994
San Jose State. January 1992; University of Southern California. November 1992
Williams College. (3 talks) Geology, Environmental Studies. February 1991; Duke University. Geology. February 1991; University of Wyoming. November 1991; University of Texas, Austin. November 1991
UC Berkeley. April 1990; UC Santa Barbara. January 1990
Bowdoin College. January 1988; UC Santa Cruz. February 1988
UCLA. October 1987; Johns Hopkins. April 1987