From Wikipedia:
“In 2004, Jones was one of “100 notable Americans” who signed a “911 Truth Statement” from 911Truth.org. The statement demanded an investigation of “unanswered questions that suggest that people within the current administration may indeed have deliberately allowed 9/11 to happen, perhaps as a pretext for war.”[18] Jones appears as signer number 46 to the document.[19] In September of 2009, Jones issued a statement regarding the 9/11 truth letter saying “the petition that was circulated today, I do not agree with this statement and it certainly does not reflect my views now or ever.” He has not yet provided an explanation of how or why his name appeared in the letter however.[20]”
He was for the 911 Truth Statement before he was against it.