Ryan at Apex does a fair amount of medical stuff. I did his TacMed class--8 hours. It covered some stuff I personally will definitely not try to use, like decompression needles for tension pneumothorax and such. (I've got a needle in my trauma kit, though, in case anyone around me is willing to stick someone who needs it. My wife's an RN--I think she could pull it off!) But mostly it was very good, relevant info and it had some scenario training and other ways to make you think under a little pressure. He includes medical units in other classes, too--there's a medical block in both the armed and unarmed active shooter classes, for example. I don't know exactly what his formal background is for teaching this, but I can say that I've done medical blocks with other trainers, including at the FASTER active shooter class at TDI in Ohio (as well as a basic stop the bleed, etc), and what Ryan is teaching, and how he teaches it, lines up with what I've learned elsewhere.