Jennifer Sizemore has been named managing editor of MSNBC.com (www.msnbc.msn.com) and executive producer of NBC News.
Sizemore had been deputy editor for news at MSNBC.com.
In her new role, she will oversee MSNBC.com's newsroom, drive editorial strategy and work with the entire NBC News organization to maximize delivery of Web content to news consumers.
The network said Sizemore is the only woman leading a major national online-news editorial operation.
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