Phil LaMarr, who I best know as Marvin from Pulp Fiction, but who you may know as Vamp in Metal Gear Solid 2 and 4, or as Ratbag from Shadow of Mordor. He also played Hermes in Futurama and Ollie Williams in Family Guy! You can follow his random musings here.
Matthew Waterson, who played very English person Sir Lucan in The Order: 1886, an has recently acted in Fallout 4 and Halo 5. Check out Matthew's amazing Sean-Connery-themed profile picture.
Terra Deva, an oft-performing musician, including recent hit single "At Night" with the swiss group Shakedown (though she doesn't play music in The Witness because we don't have music in The Witness! She is acting!) and veteran of... The Mickey Mouse Club!!!! (Among many other places!) Terra's Twitter page is here.
We recorded these sessions at Warner Bros. Studios. Our voice director was Liam O'Brien, who has also done quite a bit of acting in games himself. Pierce O'Toole acted as the great force of organization throughout the process and many things would have gone worse were it not for him! Having said all this, I will warn you that the story in The Witness, such as it is, is fairly subtle and happens mostly implicitly. You really have to explore and read between the lines to know what's going on. So do not expect a traditional game story like The Last of Us or The Order! All that said, we are very happy to have these actors lending their talents to our game, and I look forward to release when you'll see what we've been up to.