I've looked for more information on Ai-ping Yeh who has been teaching her "closed form box" pin method for a couple of years. There's very little about her on the web. Perhaps students of hers can fill me in. Here are pictures from her June class in Philadelphia.
I learned from web bits and pieces that she "has worked in polymer clay for eight years, is a member of the South Bay Polymer Clay Guild and received a MA in jewelry design in 1991."
Her forms are intriguing with their depth, angles, curves, windows and holes…there's a lot happening in a little space. I'd like to know more. Glass Attic has a long description of Ai-ping's method that you might find helpful.