Less than a month ago, NBCUniversal announced that it would enter the streaming wars with a new service named after its colorful NBC logo-slash-mascot.

The service, called Peacock, is scheduled to make its mark in April with some 15,000 hours of content. The streaming service was being developed under the leadership of its chairwoman, Bonnie Hammer, who had previously served as the head of NBCUniversal Cable Entertainment, where she oversaw NBC’s cable channels.

Cut to the present. Ms. Hammer is no longer the head of Peacock. In her place, NBCUniversal has installed Matt Strauss, a longtime executive from NBCUniversal’s parent company, the telecommunications giant Comcast. Mr. Strauss was most recently the executive vice president of Comcast Cable’s digital arm, Xfinity Services. As part of the shake-up, Ms. Hammer has been named the head of NBCUniversal Content Studios, a newly created part of the company.

Ms. Hammer, 69, and Mr. Strauss, 48, will report to Stephen B. Burke, the chief executive of NBCUniversal.