Not only did Jeff invent Amazon.com, he also has a little-known sideline there.
I came across a review by him, so noodled around and found all eight.
They were written between February 2000 and November 2003.
Here's his mini-bio [with pic], which appears on this page (his reviewer rank is 8,321):
"Work at Amazon.com. Known for my laugh. That's me in my Austin 'Danger' Powers Halloween costume."