John Garihan has taught classes for undergraduate students at Pennsylvania State University (1968-1973), Indiana University Northwest (1973-1979), and Furman University (1979-2013). These include introductory and major courses in structure, tectonics, geology, field geology, and supervision of senior mapping projects in the South Carolina Inner Piedmont. He also taught field geology at Indiana University’s Geologic Field (for thirteen years between 1974 and 1990), which some Furman students attend. Served 6-years as Chairman, EES Department. Appointed to South Carolina Board of Registration for Geologists as the Academic board member, February 1996 - June 1999. He served as Editor-in-Chief of South Carolina Geology (2007-2012).
He has written peer-reviewed articles for publication and edited over ten guidebooks covering the geology and hydrology of upstate South Carolina. He has lead/co-lead numerous regional geologic field trips for students and professionals (to US Mid-continent, Rockies, and Appalachians, Canada, Mexico, and Iceland). From 1979-present he has mapped and published seventeen 7.5-minute geologic quadrangles (covering ~1100 square miles) as part of his an on-going research program. For 15 years he has been an unpaid Volunteer for the South Carolina Geological Survey, which logistically and technically/cartographically supports the past and currently active geologic mapping and map publication. Furman students have participated in the geologic mapping, and they are cited as co-authors on six published South Carolina geologic maps.