Conversation so far:
What happened in Gred's career?
He then worked as a staff writer at Prevention magazine.
Which of his work was noteworthy?
Gutfeld then became editor in chief of Stuff, increasing circulation from 750,000 to 1.2 million during his tenure.
Which other names were mentioned in his career?
Gutfeld was one of the first posting contributors to The Huffington Post from its launch in 2005 until October 2008.

Question: What was his contribution in his career?
Self-contained rewrite: What was Greg Gutfeld's contribution in his career?