At the close of Friday’s “Nightly News,” and again during his tease on “Today,” Brian Williams announced two new members of the NBC News on-air team would be joining him on the show tonight ahead of their stories on tonight’s “Rock Center.”

We’ll look for you right back here Monday night when we’ll be joined by Ted Koppel and Chelsea Clinton prior to their reports “Rock Center.”

On Friday, Clinton wrote a blog post about her story:

As I started to think about my first ‘Making a Difference’ segment, I knew I wanted to focus on an organization that was scalable – either in the sense that it could be serving more people if it were to have more resources, or it could be a potential model for other communities.