"I'll be reporting every day for CNN, CNNI, CNN.com, and I'll flow it all into @CNNReliable on Sundays," he said in a tweet.
Stelter, 28, graduated from Towson University in 2007 and immediately joined the Times.
He has been one of several guest hosts since Howard Kurtz left CNN to host a new show, "Media Buzz," on Fox News.
“Brian has emerged as one of the top media reporters in the country and will be a great addition to our many platforms,” Jeff Zucker, president of CNN Worldwide, said in a statement.
"I've been at the @nytimes since leaving college so it's surreal to be leaving," Stelter said in another tweet. "I've learned eveything here. To my colleagues: thank you."
It was an interesting sign of the media times to follow Stelter's tweets running ahead of CNN PR effort.
“It is an honor to take the helm of Reliable Sources, the very best of a very small number of programs about the media’s role in society,” Stelter said in the release from CNN.
“I’m equally excited about reporting throughout the week on CNN’s many digital platforms and television networks. CNN is reimagining media coverage at what is the best time ever to be covering media, and I’m very happy to be a part of it.”
On Nov. 3, "Reliable Sources" drew an audience of 391,000 viewers to CNN, while "Media Buzz" was seen by 911,000 viewers in head to head competition at 11 a.m.
Since its launch 10 weeks ago, "MediaBuzz" is averaging 862,000 in total viewers and 168,000 in the key news demographic of viewers 25 to 54 years of age.
CNN’s Reliable Sources is averaging 454,000 in overall viewers and 125,000 in the key demo during that same period of time.
Since leaving "Reliable Sources" and joining Fox, Kurtz's audience has grown by 86% in total viewers and 21% in the key demographic group.
All figures are from Nielsen Media Research.
Politico was the first to report Stelter's hiring Tuesday.
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