The first was academic physics, receiving a Ph.D. from the University of Washington and a post-doctoral stint at the Joint Institute for Laboratory Astrophysics.
The second incarnation was in the Defense and Space industry, mostly at the Boeing Company.
Starting my own business, OptoMetrix, Inc., for development and manufacture of test instruments for the semiconductor industry became the third incarnation.
I am now semi-retired as a fiction writer.
See my website at www.raaronfalk.com and signup to receive an occasional newsletter.