I wasn't familiar with the name, so I looked it up. There are some pretty strong criticisms of him here: http://www2.technologyreview.com/sens/docs/estepetal.pdf
Looks like pseudoscience.
I have seen him speak a couple of times and he addressed many of these criticisms in the talks. You might want to read his response to these criticisms before assuming they are valid.
A lot of this comes from a lack of appreciation of the difference between science and engineering. In engineering you just have to find something that works. You don't need to understand everything.
Some debate here and you can easily find his talks online:
http://www2.technologyreview.com/sens/
In his talks I did not get the sense that he is positioning himself as a great misun...
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