Professor Griffin is a leading figure in the "9/11 truth movement." He wasn't always involved. He was asked if he would look into it and it took some time for him to be convinced that the official stories did not add up.
He also realized that those involved in the movement were not likely to be able to publish books and he knew how to get that done. He has used his skills in research and scholarship toward searching for the truth behind the events of September 11th, 2001.
His latest book is entitled: The Mysterious Collapse of World Trade Center 7: Why the Final Official Report about 9/11 is Unscientific and False.
This is from his introduction:
There are two main theories as to who was responsible for the 9/11 attacks. According to the theory put forth by the Bush-Cheney administration (and it is merely a theory, because no proof has ever been provided), the attacks were planned and carried out solely by al-Qaeda terrorists under the authorization of Osama bin Laden. The alternative theory, espoused by members of what has come to be known as "the 9/11 truth movement," holds that the attacks were orchestrated by officials of the Bush-Cheney administration itself.On this website, davidraygriffin.org I discovered a speech he delivered in May of this year, Understanding Deep Politics Featuring David Ray Griffin. He speaks about WTC7.
According to members of the 9/11 truth movement, the attacks were a "false-flag" operation, in which evidence is planted to implicate the groups or countries the actual perpetrators wish to attack. In this particular case, the Bush-Cheney administration had already decided, months before 9/11, to attack Muslim countries in the Middle East, most immediately Afghanistan and Iraq. In planning out the 9/11 attacks, the perpetrators planted evidence to implicate Middle Eastern Muslims--evidence tht, when examined, can easily be seen to have been fabricated.
The 9/11 truth movement holds that, when the official account of the attacks is subjected to critical scrutiny, it can be shown to be false. Many members in the movement believe this falsity to be most obvious in relation to the collapse of Building 7 of the World Trade Center, usually called "WTC7." This collapse, is accordingly, often referred to as the official account's "Achilles' heel" or "smoking gun." p. xi
I first heard of David Ray Griffin when I read his book Christian Faith and the Truth Behind 9/11: A Call for Reflection and Action. This is the only book of his I have read, although now I have his latest and another, The New Pearl Harbor Revisited: 9/11, The Cover Up, and the Expose is on order.
Professor Griffin is a member of Scholars for 9/11 Truth and Justice. Here are two websites not managed by him but dedicated to his books and videos.
A search for David Ray Griffin video will lead you to a number of presentations by Professor Griffin. Here is a presentation from 2005 at the University of Wisconsin called 911 and the American Empire. I think you will appreciate it.