In article , says...

But I will remember him mostly for his contribution here on the Columbia
Accident Investigation Review Board FAQ. A brief search (all I have time
for at the moment) could not turn up this excellent web page of his as a
fitting memorial. Perhaps when I have more time or another reader perhaps?

Clearly this isn't the original, but an archived copy, but still, here
it is:

http://www.freerepublic.com/focus/news/837444/posts

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer