(I'm bolding the part which was news to me as I read it. - Adam)

Hansen: Official 9/11 story is hooey, critic says

David Ray Griffin comes to Drake University on April 23 to tell us why the official explanation for the 9/11 attack on the United States doesn't hold water.

A theologian, philosopher of religion and professor emeritus at California's Claremont School of Theology and Claremont Graduate University, Griffin has been at it for about seven years now and says he won't stop until the government conducts a new, impartial, independent investigation.

As opposed to the 9/11 Commission probe. He calls that exercise a charade.

Griffin has written eight books on the subject with another on the way: "Cognitive Infiltration: An Obama Appointee's Plan to Undermine the 9/11 Conspiracy Theory."