Marketing guru. Sold YoYoDyne to Yahoo in the first dot-com bubble (hmm, that sounds familiar ;-)), became Yahoo's VP of direct marketing, published a bunch of short & pithy marketing books, and now blogs a lot of largely-content-free-but-occasionally-insightful posts.
"Short and pithy" and "legitimately pretty good" aren't mutually exclusive. I actually like a lot of his later books. His blog posts are pretty inconsistent, though.