There are a lot of people making job changes in December and now that their LinkedIn profile is updated the information is public. One of the latest changes is Kevin Heslin leaving the publishing world at Mission Critical Magazine for Research Manager with 451 group.
Kevin spent 13 years at Mission Critical.
I once was on a panel with Matt Stansberry, Kevin Heslin, Rich Miller to discuss data center publishing. Since that presentation everyone has changed organizations. Matt is now with 451 Group along with Kevin. And Rich Miller is part of iNetinteractive. http://www.inetinteractive.com/blog/news/data-center-knowledge-acquired-by-inet-interactive/
Change is constant even in the data center industry.