You live you learn My favorite professors typically worked full-time in the field and taught part-time. Several of my GIS School professors fit that profile and it's part of why the UC-Riverside program is the best in the world. One professor was a professional surveyor. You could see in his body language how he related to geometry as his body being a physical point in a giant triangle while recording satellite readings to establish the data sufficient to accurately mark a point in space to within a few feet. When I had a corporate job I frequently fantasized about working half time at my claims processing job and half time as some kind of educator or problem solver, trying to improve the job experience and work efficiency of the department. I never could figure out how that would work. Usually what happens is someone who used to do X retires and moves on to teaching. Sometimes because they can no longer do X. Those who can, do. Those who can't, teach. In some cases, that wo...