A good question. I've seen a couple of videos of him teaching instructors and he demonstrated good explaination of his points and good teaching presentation. Best I could find on his background is that he started instructing at one of the big name places.

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Re: Mas Ayoob's small town experience.

Mas has stated that being on a smaller force gave him the opportunities to take training and attend professional conferences etc. He's not sure he could had have done that on a bigger force - at least not as early on in his career. Also NH has something called "police prosecutor." That began his experience in working with prosecutors and the courts. So does have a fair (maybe alot) of formal as well as on the job training in the subjects he tends to focus on.