From Muppet Wiki

Charles Gibson (b. 1943) is a television personality best known as an anchor on ABC's Good Morning America from 1987 to 2006. In this role, he interacted with the Muppets during several of their appearances.

In Sesame Street Episode 4149, he presented "predicament" as the Word of the Day.

Gibson voiced Charles Blitzen, a Muppet reindeer news anchor, in Elmo's Christmas Countdown.