I am an electrical engineer, worked as an engineer at DuPont running instrumentation on chemical processes. I then owned my own computer business for 25 years finally selling. I then sold computer training and taught computers and networking for 5 years at a 2 year college, and am now recruiting engineers for companies. I have taken 15 courses in engineering that entail advanced calculus and physics. My students claimed that I was their best teacher because I tried to show the methods that explained text material in a novel and different way for their enlightenment.