Bachelor of Science, University of Minnesota, 1966; Master of Science, Northwestern University, Evanston, Illinois, 1969; Doctor of Philosophy, Northwestern University, Evanston, Illinois, 1970.
Assistant professor, State University of New York, Binghamton, 1970-1974; geological engineer, Alaska Division Geological Surveys, Anchorage, 1976-1980; geologist, United States Geological Survey, Anchorage, 1980-1991; deputy for volcanoes, United States Geological Survey, Reston, Virginia, since 1991. Teacher geology Chapman College, Fort Richardson, Alaska, 1976-1977. Chairman Federal Committee Aviation and Ash, since 1991.
Lobbyist Nordic Ski Club, Anchorage, 1990-1991. Member Alaska Geological Society (board directors 1977-1978, journal editor 1979-1980).
Married Kaaren Ruth Johnson, January 14, 1978 (divorced May 1987). Married Diedra Bohn, June 30, 1991. 1 child, Kirsti Maija.