Wikipedia says this about David Ray Griffin’s work on 9/11:
Since his retirement, he has moved his focus from questions of philosophy and religion to one of politics and, specifically, questioning the 9/11 attacks. His recent work includes the book, The New Pearl Harbor: Disturbing Questions About the Bush Administration and 9-11 (2004) and The 9/11 Commission Report: Omissions and Distortions, books in which he argues there is evidence members of the United States government were behind the September 11, 2001 attacks, and Christian Faith and the Truth Behind 9/11: A Call to Reflection and Action in which he summarizes some of what he believes is evidence for government complicity and reflects on its implications for Christians.
The Presbyterian Publishing Corporation, publishers of Griffin’s Christian Faith and the Truth Behind 9/11, noted that Griffin is a distinguished theologian, and praised the book’s religious content, but said, “The board believes the conspiracy theory is spurious and based on questionable research.”
In The New Pearl Harbor, Griffin supports the work of other theorists who assert that elements of the US government were behind the attacks on the Pentagon and the World Trade Center in New York City. He purports to use his training in logic to analyze the validity of their arguments. Griffin states the overall thesis of his argument: There should be a well funded and thorough-going investigation of all the questions raised about the 9/11 attack. Griffin also appeared on C-SPAN that covered his talk, ’9/11 and American Empire: How should religious people respond?’
In an interview with Nick Welsh, Thinking Unthinkable Thoughts: Theologian Charges White House Complicity in 9/11 Attack , Griffin analyzes charges that the US government sent airplanes into the Twin Towers of the World Trade Center, and these airplanes were only a cover for explosives that the US government had planted within the World Trade Center towers and 7 World Trade Center. Griffin also talked with Alex Jones. 
The second edition of The New Pearl Harbor contains additional material on the Saudi Arabian hijackers, Sibel Edmonds, his analysis of the official 9/11 Commission set up by the US government, and his belief that the US Government deliberately changed its standard rules for analyzing military intelligence in order to allow the attacks.
The New Pearl Harbor purports to identify unanswered questions concerning the 9/11 attacks, using a model of attempting to fit them first into a conspiracy/complicity theory, and then to a coincidence/incompetence theory. He further explores the contradictions inherent in each theory, concluding with the need for a full and independent investigation led by the press.
Critics of Griffin’s thesis, such as Chip Berlet, say that many of the claims in the book are refutable. Griffin has rejected these criticisms  and debated Berlet. Other reviewers like Mike Williams claim to have found various problems .
In a review published in the magazine The Nation, former CIA agent Robert Baer dismissed the gist of Griffin’s writings as one in a long line of conspiracy theories about national tragedies, but stated that the Bush administration had created a climate of secrecy and mistrust that helped generate such explanations (“Dangerous Liaisons,” September 27, 2004).
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