David Shannon
David Shannon is an actor who appeared as a Human official in the  fourth season episodes  and  He received no credit for his appearances but is listed on the call sheet.

As an actor, Shannon worked between 1997 and 2012 under the Screen Actors Guild. He was a regular background actor on the television series Alias between 2003 and 2006 where he worked with Bart Noggle and Nikki Flux. Other projects include episodes of NCIS: Naval Criminal Investigative Service, the comedy Anchorman: The Legend of Ron Burgundy (2004, with Holmes R. Osborne, Chuck Poynter, Glen Hambly, Jimmy Bennett, and Scott St. Blaze), and the fantasy drama Slipstream (2007, with Christian Slater, Michael Clarke Duncan, Fionnula Flanagan, William Lucking, Scott L. Treger, and Bill Blair).

Besides acting, Shannon also works as author and published the books "Hell in the Head" and "The Four-Twenty Group". Today, he resides in Atlanta, Georgia.

External link 
  – official site

Performers
ENT performers