Justin Roiland is an American actor, animator, writer, producer and director. He is best known as the co-creator and executive producer of Adult Swim's Rick and Morty, in which he voices the show's titular characters. He also voices Oscar on Disney Channel's Fish Hooks, the Earl of Lemongrab on Cartoon Network's Adventure Time and Blendin Blandin on Gravity Falls. Description above from the Wikipedia article Kari Wahlgren, licensed under CC-BY-SA, full list of contributors on Wikipedia.