I've been a service station attendant, steel building erector, combat helicopter pilot (1,200 hours in Viet Nam) instructor pilot in airplanes and helicopters, ambulance helicopter pilot, and most recently a corporate pilot with approximately 200 North Atlantic crossings.
I started writing 12 years ago while at my job. Well, I didn't write books in the cockpit, but while traveling to my airplane on the airlines and while sitting in hotel rooms on standby.
You might find my job description interesting; I worked seven days on and seven days off. Day one normally was devoted to traveling on the airlines to my airplane and meeting my crew (First Officer and Flight Attendant). We would fly our airplane anywhere in the world for five days, and on day seven would leave our Gulfstream where-ever it happened to be and airline to our homes for our seven days off. It was the best job in the world, and I had plenty of forced isolation time to write.