recommendation - a good arborist in/near Dunwoody?

Hi, I hope this isn't inappropriate to ask in this section of the forum. I just "found" TCI this morning, and am so excited to see classes located near where we live, Dunwoody, Ga. I've been seeking some advice & possibly the name of a good arborist for the last week or so. I can go into the details if wanted, but it's kind of a long story. Briefly, it has to do with a maple that's slowly dying after its roots were severely cut 5 years ago when sidewalks were installed.

Until now, I'd only been to the forum on TreeBuzz, & was given a lot of good advice. But hopefully someone here might be able to give me the name of someone to call. Other than that, I'm looking forward to taking a class on recreational tree climbing soon! TIA