Brian Williams writes: Today NBC underwent the second change in ownership in its history. In a studio 55 stories beneath the red neon letters atop this building that will continue to glow "GE,” Comcast of Philadelphia officially took the reins of ownership in what is, at first, a 51/49 takeover deal, leaving GE the minority owners. It was my job to preside over an employee forum, introducing the new CEO Steve Burke to employees. Steve is the scion of a great television family: His father, Dan Burke, of Cap Cities/ABC fame, is one of the greatest and most popular executives of the modern television era. Steve was literally raised on over-the-air television, and now runs a massive cable, broadcast and internet communications company—the largest there is. And so: While you won't notice anything different about us tonight, a new era begins here behind the scenes. And there are many, many stories to report to you tonight. Beginning right outside our window. We hope you can join us tonight.