Just recently did a glaze workshop with John Britt. It was great! John is such an amazing teacher. He has the ability to take something very complicated , glaze chemistry no less, and put it into understandable terms. Not only was the workshop great, but John is an all around fun person to be with. I recommend this to anyone interested in clay. Wish I had done this years ago!!!! Too bad I had to wander in the desert for 30 years.