Ken Shenstone –
..an artist whose clay work focuses almost exclusively on wood firing in an anagama style kiln. Firing with wood creates surfaces like no other method of firing. The burning wood provides heat, but the fine layer of ash laid down upon a pot reacts with the clay at high temperatures, forming a natural glaze. These deep, rich, natural ash surfaces are my areas of research and expertise.

excerpt from web site: http://kenshenstone.com/