The more dark a person's nature, the more likely they are to need religion to contain them.

Film, theatre and television actor, comedian, voice artist and television writer                          

Selected Works:

Films:

The Simpsons Movie - 2007
The Pursuit of Happyness - 2006 
Casper's Scare School - 2006 
I-See-You Com - 2006 
The Jimmy Timmy Power Hour - 2004 
The Cat in the Hat - 2003 
Kim Possible: The Secret Files - 2003 
Buttleman - 2002 
Hey Arnold!: The Movie - 2002 
Return to Never Land - 2002 
Neil Simon's Laughter On The 23rd Floor - 2001 
Joseph: King of Dreams - 2000 
Space Jam - 1996 
Love Affair - 1994 
The Client - 1994 
The Return of Jafar - 1994 
Super Mario Bros  - 1993 
Don't Tell Mom the Babysitter's Dead - 1991 
The War of the Roses - 1989 
K-9 - 1989 
The Thing that Ate Everybody - 1989 
Say Anything    - 1989 
Nothing in Common - 1986 

Television:

Greek - 2007 - Dr  Milton Hastings
Entourage - 2007 - Andrew Preston
That '70s Show - 2006 
Veronica Mars - 2006 
Legion of Super Heroes - 2006  - Boris the Butler, Captain Howdy
Complete Savages - 2004-2005  - Episode - Free Lily  - Mr  Horner/Franklin the Frog
Stargate SG-1 - 2004  Sci-fi series - "Stargate SG-1 - Citizen Joe" 
Arrested Development - 2005  - Doctor Stein
The Batman - 2004  - Scarface
Behind the Camera: The Unauthorized Story of Charlie's Angels - 2004 
Frasier - Goodnight, Seattle  - 2004  - Brad
Everybody Loves Raymond - 1998, 2003  - Coach Bryan
Reba - 2002 - 2003  - Eugene Fisher
Yes, Dear - 2001  - Walt
Disney's House of Mouse - 2001 
Recess: School's Out - 2001 
Olive, the Other Reindeer - 1999 
Cow and Chicken - 1997 
Hey Arnold! - 1996-2002  - Grandpa, The Jolly-Olly Man
Friends - 1996  - The Zoo Keeper in "The One After the Superbowl, Part One"
Aladdin - 1994-1996  - Genie
Earthworm Jim - 1994  - Jim
Sonic the Hedgehog - 1993  - Lazar the Wizard in Super Sonic
Back to the Future: The Animated Series - 1991-1993  - Doctor Emmett L  Brown
Darkwing Duck - 1991  - Megavolt
Rugrats - 1991 - 2003  - Johnathan
Taz-Mania - 1991 
Fievel's American Tails - 1991  - Chula the Tarantula
Dynamo Duck - 199X  - Narrator
Tale Spin - 1990  TV Series
Married  With Children - 1990  - Pete
The Simpsons - 1989-present 
The Tracey Ullman Show - 1987-1990 
Beyond the Magic Door - circa 1983  - Detective Farblonget
Yes, Dear - Walt
Futurama - various episodes between 1999 and 2003  Robot Devil - 'Beelzebot' 
The Tick - Plunger man, various characters                           

Mother  Elsie
Father  Louis  Castellaneta
Wife Deb Lacusta                          

Voice of Homer Simpson.
As of April 20, 2007, Castellaneta has beaten James Arness and Kelsey Grammer for the longest running portrayal of a fictional character on prime-time American television.                          

On The Simpsons, Castellaneta provides the voices for Homer Simpson, Abraham "Grampa" Simpson, Barney Gumble, Krusty the Clown, Groundskeeper Willie, Mayor Joe Quimby, Hans Moleman, Sideshow Mel, Itchy, Kodos, Arnie Pie, Scott Christian and others.