Water and Environmental Research Center, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, Alaska, USA

Geophysical Institute, University of Alaska Fairbank, Fairbanks Alaska, USA

Mining and Geological Engineering Department, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, Alaska, USA

US Geological Survey, Alaska Science Center, Anchorage, Alaska, USA

Emeritus

US Geological Survey, Alaska Science Center, Anchorage, Alaska, USA