Traveling instructors, that come to my pre-caffeinated mind: Mas Ayoob, Tom Givens, Michael de Bethancourt, and Craig Douglas, a.k.a. Southnarc. Plus, anyone who has ever been an AI with either of these two gentlemen. Be aware that ECQC and AMIS, taught by Craig, can get very physical, but one ECQC student was 71 years young. I either know these men personally, or have attended at least lecture-level training with them.
Brian Hoffner, in SE Texas, is a full-time firearms instructor for a large PD, but does have a site, and does some amount of private training. I work for the same PD, and know him. I have not (yet) attended any of the private training he does, just the basic and some of the more-advanced LE stuff.
If she is actively teaching, Debbie Lokey, retired from Houston PD, was instrumental in helping me learn DA sixgunning, in the Eighties.
Darryl Bolke and Wayne Dobbs, in the DFW TX area. I have never trained with them, but people I personally know and respect do personally know them.
If he is still active, Steve Moses, in Texas, probably north or central part. An instuctor in his own right, he was a fellow student in an ECQC class. Good instructors will attend training, to refresh and expand their knowledge.
William Aprill, in the US Deep South. He is known more for teaching subject matter than shooting, but what he teaches is gold. I have met him, but not actually trained with him.
John Hearne, is also in the US Deep South. He mostly trains law enforcement, but if you have a chance to train with him, I bet it will be gold. I have met him, but not actually trained with him.
Clint Smith, of Thunder Ranch, is an obvious choice for training, even for beginners. One of my colleagues trained at Thunder Ranch repeatedly while it was in Texas. I regret not training at Thunder Ranch before it moved to Oregon.
This is not a complete or exhaustive list. None of these ladies or gentlemen are names I have merely repeated after being found on the internet. I am sure I have forgotten some good ones, that I know, but my fatigue-fogged mind is not remembering at the moment.
BEWARE of any instructor who claims to be teaching The One True Way, and says everyone else is doing it wrong.