Jan Harrell does. She is connected in some way with the Center for Contemporary Crafts in Houston, TX..
Thanks, Candy -- I believe she teaches at Glassell, which is affiliated with the Museum of Fine Arts Houston; there was an enameling workshop on the spring schedule, but I missed it and, sadly, cannot do a full semester there. :-)
Perhaps she will offer something again soon. I'm especially interested in experimental techniques.
I met Jan when she was one of the crafts people in residence at Contemporary Crafts so that's what I thought of first. I don't live in Houston so I don't keep up with the classes there, unfortunately. Hope you find something to pique your interest.
Am feeling a bit stale lately; would love to connect with other Houston-area enamelists for workshops or even just a friendly play day.
If you are up for a little drive, Creative Side Jewelry Academy in Austin frequently has pros Ricky Frank and Harlan Butt teaching week long or weekend classes!