Overmyer is also a playwright of note. Having lived in New Orleans I can say that this is the first depiction I've seen that captures the many sides of the city and not just the touristy aspects.

Anyone inspired by TREME to visit New Orleans should check out the documentary DON'T EAT THE BABY (avail on Amazon). It's a great primer on New Orleans, Mardi Gras, and many of the traditions spotlighted in TREME.