Working most of the year as teachers means they can't make much at that summer job, though. I had a high school biology teacher who worked as lab tech in the summers, which she described as low-level work that she did just because she loved being in the lab. She was extremely sharp, but I don't think there was any way she could have trained for a more difficult position or taken on any higher responsibility when she couldn't stay on the job for more than a few months at a time. That was the only teacher I had who had any summer job that required education, except maybe for teachers who worked at a family business during the summer.