Yes, that's John Slattery. He guest stars on this episode of Arrested Development.
A picture of George Bluth Sr, the patriarch of the Bluth family and the founder of Bluth company.

Arrested Development Quotes

She sometimes takes a little pack of mayonnaise and she'll squirt it in her mouth all over. And then she'll take an egg and kind of...mmmm! She calls it a 'mayon-egg.' Are you okay?

George Michael

Oh, mercy me! I forgot that we were in the colonies.

Mrs. Featherbottom