Dr. Halsor has taught at Wilkes University for 30 years. Originally from Oregon, he received his undergraduate degree in Geology at the University of Oregon and then traveled extensively throughout the West while employed as an exploration geologist in the oil and mineral industries. A fascination with mountain systems and their geologic formation led Dr. Halsor to Michigan Technological University where he earned his Master's and Doctoral degrees in geology. It was at Michigan Tech where Dr. Halsor cultivated his growing interest in volcanic processes, inspired by the 1980 eruption of Mt. St. Helens and by exceptional research and field experiences in volcanology provided by Professor William I. Rose.  Dr. Halsor’s primary teaching responsibilities are in geology and geospatial technology that serve undergraduate programs in Geology, Earth and Environmental Sciences and Environmental Engineering.  Dr. Halsor is coordinator for the minor program in Geology and serves as an advisor to independent and senior capstone research projects. Dr. Halsor is the “hard rock” geologist in the Department with research areas that include geologic hazards, igneous rock-formation processes, mineral resources and solid earth energy.  He conducts research on active volcanic systems in the western U.S., Central America, Mexico and Indonesia.  Over a ten-year period, Dr. Halsor led an annual, high-precision GPS ground deformation survey with Wilkes University students at Yellowstone National Park. 

Exploration geologist in oil and gas plays, Rocky Mountain region; exploration geologist in precious metals, southwest U.S. Basin and Range and northern Rocky Mountain regions; exploration geologist in base metals, southeast Alaska;

Hired: Assistant Professor of Geology, 1987; Awarded Tenure, 1993
Promotion to Associate Professor of Geology, 1994
Promotion to Full Professor of Geology, 2002
Department Chair, 2015 - present

  • Ph.D. Geology, Michigan Technological University, Houghton, MI
  • M.S. Geology, Michigan Technological University, Houghton, MI
  • B.S. Geology, University of Oregon, Eugene, OR
  • Introduction to Geology
  • Physical Geology
  • Mineralogy
  • Petrology
  • Geologic Hazards
  • Bowman, N., Creedon, K., Kopec, K. and Halsor, S.P., 2017, Composition of Whiteface Mountain anorthosites and its bearing on rock forming processes. Geological Society of America, joint Northeastern/Central Regional meeting, Pittsburgh, PA.
  • Mook, E. and Halsor, S.P., 2017, Pennsylvania energy: past, present, and future. Geological Society of America, Northeast Regional meeting, Pittsburgh, PA.
  • Austin, A., Rice, B., Wagner, B. and Halsor, S.P., 2015, The stratigraphic correlation of the Forkston semi-anthracite to the northern anthracite field in Pennsylvania. Geological Society of America, Northeast Regional meeting, Bretton Woods, NH.
  • Skvarla, K. and Yamrus, L., 2014, Modeling compositional variation in volcanic rocks from the north flank of Mt. St. Helens, Washington. Geological Society of America, Northeast Regional meeting, Lancaster, PA.
  • Halsor, S.P., 1999-2008, GPS Measurements of Crustal Deformation at the Yellowstone Caldera, Yellowstone National Park. Annual reports submitted to the Office of Research, Yellowstone National Park, WY.
  • Chesner, C.A and Halsor, S.P., 2006, The Escuintla and La Democracia debris avalanche deposits, Guatemala: constraining their sources, Geological Society of America, special paper 412, p. 105-120.
  • Wilkes University Admissions and Financial Aid, 2016 – present
  • Advisor, Wilkes University GeoExplorer Club, 2016 – present
  • Campus advisor, Geological Society of America, 1995 – present


  • Halsor, S.P. and Frederick, H., 2014, Acquisition of two advanced analytical instruments, 2014, Alden Trust, $134,000.
  • Licensed professional geologist in Pennsylvania
  • American Geophysical Union
  • Geological Society of America
  • Pennsylvania Council of Professional Geologists