John Diehl received his BSME in 1976 from California State Polytechnic Institute of Pomona. His Masters in Civil Engineering was received in 1977 from UCLA, where he also attended to receive his MBA in 1988. With two partners, he founded GEOVision in 1995, which thirty years later is one of the most respected geophysical consulting firms in the United States.

In the course of his career he has authored or co-authored over 30 publications, focusing primarily on geophysical instrumentation and geophysical testing.  Under his direction, GEOVision has supported geophysical site characterization studies at over 120 nuclear facilities around the US, and in Europe and the Middle East.

John is a lifetime member of ASCE and is a registered professional engineer in the state of California.