Tom Mazzarelli (left) has been named Co-Executive Producer of the first two hours of NBC’s “Today” show, TVNewser has learned. At the same time, Tammy Filler has been named Co-EP of the third and fourth hours of the show. Both will report to show EP Don Nash.

Mazzarelli is a “Today” veteran, having served as a senior producer on the show from 2003-2006. He left NBC for CBS where, most recently, he was senior broadcast producer of “CBS This Morning,” a job he left in January. Nash took the top spot at “Today” in November. He reports to Alex Wallace who is executive-in-charge of the show.