The changing tunes of Building Designer Leslie Robertson

[scienceplease]

I just wondered whether you have read this story on WTC towers Building Designer Leslie Robertson who seems to change his tune quite a bit. Quite importantly, I feel, he changed his tune immediately before 9/11... check out

http://americainjeopardy.blogspot.com/2007/02/yet-towers-fell.html

The question is... why would he change his story? What is in it for him?

Try this, from his firm's website:

http://www.lera.com/sep11.htm

"...participated in the development of a database of structural information for the two towers of the World Trade Center (WTC1 and 2)"

The question is: how much was he paid?