According to this article from GameSpot, their editor-in-chief Greg Kasavin is leaving to pursue a "once-in-a-lifetime opportunity" as a game developer:
The name Greg Kasavin is synonymous with GameSpot. As one of the veteran members of this Web site, Kasavin has helped shape GameSpot for more than a decade.Next week marks Kasavin's last at GameSpot, as he has decided to pursue a goal he has had since he was a child and approach the industry from the other side. He has accepted a "once-in-a-lifetime opportunity" at an established development studio.
"My friends, family, and close colleagues have known that making games has always been my goal," says Kasavin in a farewell blog post. "But breaking into that business is hard, and I wasn't going to do it until I was ready. At last, when faced with a once-in-a-lifetime opportunity to get my foot in the door and contribute to one of my favorite gaming franchises, I still didn't have an easy time making the choice. That's because, in case it hasn't been abundantly clear, I love this job."
Kasavin has been writing game reviews for GameSpot for the better part of 10 years, and began working for this site as a college intern in 1996. Outside of GameSpot, Kasavin has served on the judging panel for the Game Critics Awards, which offers post-E3 honors to games "that will shape the future of interactive entertainment," and was featured as the subject of a 2002 Penny Arcade Web comic.
While I personally was never particularly fond of Kasavin's reviews, you have to respect what he has done as GameSpot's editor, and if I could manage to be in his shoes six years from now (he is 6 years older than I am) I'd be pretty pleased. Farewell, Greg, we barely knew ye...