His research is focused on earthquake geology, Quaternary geology, paleoseismology, geomorphology, and engineering geology. Dr. Koehler is specialized in using advanced techniques including air photo, lidar, and satellite imagery interpretation, Quaternary geologic and geomorphic mapping, and surveying to assess geohazards in a wide variety of terrains. Dr. Koehler is particularly well versed on topics in Quaternary geology in Nevada and has mapped in numerous valleys throughout the state.