NBC’s veteran Lester Holt, 65, is stepping down as anchor of the network’s flagship “Nightly News” broadcast in the coming months. Holt, who has been the face of “Nightly News” for a decade, won’t be leaving NBC altogether, however. In a memo to staff Monday, he said he would be expanding his work on NBC’s “Dateline,” taking on a full-time role.

Holt has been a calming presence at NBC News, where his unflappable and low-key demeanor helped the news division move forward after a period of tumult. He took over “Nightly” duties after his predecessor, Brian Williams, was removed following scrutiny of claims the latter made about the details of a reporting trip to Iraq.