Mainly I know him for his voice work. But I've also seen him in a few live action roles... I always remember his face and voice, but I just don't generally remember what I've seen him in. Which is what makes IMDb so useful! There's The Blues Brothers; and Austin Powers; and an episode of The 4400; and an episode of Star Trek: Deep Space Nine; and an episode of Ned's Declassified School Survival Guide; and well... IMDb lists guest spots on lots of shows where I'm sure I've seen him, but don't remember him so well, like I said...
I know him from Jurassic Park, Merlin, Bicentennial Man, Wimbledon, The Triangle, and voice work in Legend of the Guardians: The Owls of Ga'Hoole.
Nelson, Craig T.
I know him from Coach; and The Fire Next Time; and Parenthood; and Poltergeist; and voice work in The Incredibles.
I know him from Adventures in Babysitting; and a few eps of Designing Women; and Bull; and a small role in Fireflies in the Garden; and a minor role in Switching Channels; and and some voice work.
I know him from Batman; and The Shining; and Something's Gotta Give; and Mars Attacks!; and The Little Shop of Horrors; and Chinatown. Not sure if I've seen him in anything else, but of course I should, eventually.
I know him from Underworld; and The Hitchhiker's Guide to the Galaxy; and Pirates of the Caribbean: Dead Man's Chest (and At World's End); and Harry Potter and the Deathly Hallows, part 1; and Total Recall; and The Limehouse Golem; and Ordeal by Innocence; and Pokemon Detective Pikachu; and Shaun of the Dead; and Florence+The Machine's video Free; and voice work in Astro Boy; and Rango; and Jack the Giant Slayer.
First and foremost, obviously, he is Star Trek's Spock. And um... well I'm sure I've seen him in some other stuff, unfortunately nothing quite so memorable... Oh, I do remember hearing him on the radio once in a remake of War of the Worlds, that was cool... And I like his songs "The Ballad of Bilbo Baggins" and "Highly Illogical." Also, he voiced Galvatron in The Transformers: The Movie; and Mr. Moundshroud in The Hallowen Tree; and General Konrad on Invasion America; and the Zarn in the Land of the Lost movie; and Kashekim in Atlantis: The Lost Empire.
I guess I saw him in The Return of the King. And I saw a bit of Fringe, but I stopped watching after a few eps. (I later regretted that, and I'd really like to watch the whole series, someday.) I know him better from Sleepy Hollow; and season four of Elementary; and a few eps of Salvation.
Cliff on Veronica Mars, Gordy on Ned's Declassified School Survival Guide, Mr. Turner in Grow Up, Timmy Turner, Johnny Frost on a couple eps of iZombie, and various voice work.
I know him from Stand By Me; and My Secret Identity; and Sliders; and Scream 2; and Joe's Apartment; and Can't Hardly Wait; and a trifling role in The New Guy; and Jerry Maguire; and Mockingbird Lane; and the Veronica Mars movie; and a couple eps of Scream Queens.
O'Connor, Kevin J.
I know him from Deep Rising; and The Mummy; and The Others; and Van Helsing; and There Will Be Blood; and Peggy Sue Got Married.
I know him mainly for voice work, but as far as live-action stuff goes, there's
a minor role in Good Omens; and an episode of The Good Place; and maybe some things I've forgotten (or not). I'm sure there's other live-action stuff I'd like to see (such as "Parks & Rec").
I know him from Heroes; and Hawaii Five-0; and minor roles in Get Smart; and Austin Powers in Goldmember; and Along Came Polly; and he voiced Ethan in Star Wars: Visions.
I know him from Bram Stoker's Dracula; and Leon: The Professional; and The Fifth Element; and Lost in Space; and Harry Potter and the Prisoner of Azkaban; and Batman Begins (and its sequels); and The Book of Eli; and Red Riding Hood; and he voiced Shen in Kung Fu Panda 2; and General Grawl in Planet 51.
Olmos, Edward James
I know him from Blade Runner; and Battlestar Galactica; and The Green Hornet; and Agents of SHIELD; and voice work in The Road to El Dorado; and maybe other things.
I know him from Psych; and Galavant; and a couple episodes of Supernatural; and a memorable ep of Lucifer; and an ep of Escape!; and an ep of Downward Dog.
I know him from Millennium; and Lost; and an ep of Masters of Science Fiction; and The Rocketeer; and Silver Bullet; and an ep of Star Trek: The Next Generation; and The Cutting Edge; and a small role in The X-Files: Fight the Future; and Emergence.