Arthur E. Berman is a petroleum geologist with thirty-four years of oil and gas industry experience and he's also Board Member for ASPO-USA. He recently gave a series of interviews on Shale Gas focusing on supply, profitability, price uncertainty, energy efficiency, and other financial risks. The embedded playlist is below and watching all 5 videos takes about 30 minutes. Art's blog is http://petroleumtruthreport.blogspot.com/