They actually have 120,000. ("Upwards of 50,000 (out of 120,000) Chromebooks have updated to OS56.")

They also have 46,000 PCs. So yeah - pretty decent size...

Someone related to Montgomery Public Schools. Googling the domain of their email shows up the school.

I'm going to guess they're a system administrator at a school or corporation.

School systems uses them because they are cheaper to deploy and maintain than traditional laptops.