This is Pat K. Thomas, on the left, marbling artist and teacher extraordinaire! She hails from Sevierville, TN and her fantastic art can be seen at this gallery:
http://www.cliffdwellersgallery.com/pat_thomas.htm

Here she is demonstrating the proper way to hold the
brushes to begin Sumigashi marbling to Pat Wiley-Shafer (more about her later!).