I'm a week late with this, but in case others also didn't notice, Christopher Blizzard, who has been a prominent programmer for Red Hat for nine years, has left to take a new job with Mozilla. He announced the move on his blog.
"Starting in mid-November I will be joining the evangelism team at Mozilla Corp....to help tell the story of the Open Web. My role will be to work with other open-source projects that are well aligned with Mozilla's mission and help them take part in writing that story," he said on his blog.
Blizzard has been active in projects including Fedora, Red Hat's free and fast-moving Linux product, and the One Laptop Per Child effort.