
Acting
Ian Abercrombie (11 September 1934 – 26 January 2012) was an English actor, best known for playing Alfred Pennyworth in Birds of Prey. He appeared as Elaine Benes' boss Justin Pitt during the sixth season of Seinfeld, and as a fastidious butler on Desperate Housewives.
Description above from the Wikipedia article Ian Abercrombie, licensed under CC-BY-SA, full list of contributors on Wikipedia

Rango
as Ambrose (voice)

Star Wars: The Clone Wars - The Nightsisters Trilogy
as Darth Sidious / Pirate #2 (voice)

Star Wars: The Clone Wars
as Chancellor Palpatine / Darth Sidious (voice)

Wizards of Waverly Place: Wizard School
as Headmaster Crumbs

Trust Me
as Teitelbaum

Hard Four
as Jack Ermine

Garfield: A Tail of Two Kitties
as Smithee

Inland Empire
as Henry the Butler

Marilyn Hotchkiss' Ballroom Dancing & Charm School
as Ervin Sezgin

The L.A. Riot Spectacular
as Auctioneer

Green Lantern: The Animated Series
as Ganthet (voice) · 5 ep.

Star Wars: The Clone Wars
as Chancellor Palpatine / Darth Sidious (voice) · 6 ep.

Childrens Hospital
as Butler · 1 ep.

Wizards of Waverly Place
as Professor Crumbs · 10 ep.

Moonlight
as Richard Whitley · 1 ep.

How I Met Your Mother
as Ben Franklin · 1 ep.
Hidden Howie: The Private Life of a Public Nuisance
5 ep.

Desperate Housewives
as Rupert · 1 ep.

The Batman
as Ewan Fripp (voice) · 1 ep.

Summerland
as Thomas Lindfield · 1 ep.
Wizards of Waverly Place
2007