This sound is from Uncle Iroh's Current Voice Actor: Greg Baldwin Soundboard

Greg Baldwin is an American voice actor. He is a voice actor for American voice actors. He also plays for American TV series, "The Voice of America," and "The Big Brother" He is also an American actor for the U.S.
See also: List of Avatar: The Last Airbender characters, List of television performers who died during production, List of people from New Mexico, and The Legend of Korra.