Wait, what?!
Yep.

I'm a professional DM. HA!

I love saying that.
While I'm a professional DM, this doesn't mean I'm a great DM as I'm still learning a lot and have only been doing it for a year.
Ah, well, I like to say I'm a professional DM, but it might be more accurate to describe me as an ESL teacher living in Korea. I teach late elementary through HS students, 2~4 students each class, 2 or 3 one-hour classes per week. For six of these classs, we play D&D one class per week. For one class (which my son joins), we play twice a week.
Damn, that's 8 DM sessions every week. They are shorter - 1 hour usually with a few multi-hour games mixed in - but it is still a lot to keep track of. Especially, it's difficult to remain creative and energetic. But after a year of doing this, it is still
loads of fun.
About 1/2 of my teaching hours have now become D&D. 20+ students over seven classes. They absolutely love this completely new type of game. I live in the world's capital of online gaming where there is no hint of RPG's, yet 80% of the kids say D&D is their favorite game and it's what they look forward to all week. It's awesome and I feel fortunate.
P.S. which is why I need lots of maps!