Fiber One Honey Clusters Cereal "Number One" TV Commercial with Russell Posner

Here is Russell Posner. He plays "Jack" in the Fiber One Cereal TV ad where his mom forgets to buy his cereal.
He was also in "Lost In Yonkers" a play by Neil Simon: http://theater.nytimes.com/2012/03/26/theater/reviews/lost-in-yonkers-by-neil-simon-at-beckett-theater.html

Here is the ad: