Martin Olson is the father of Olivia Olson. He plays the voice of Hunson Abadeer. Thus he and his real-life daughter play an evil father and daughter on Adventure Time. He's also the author of The Adventure Time Encyclopædia, and produced a CD with his daughter called "The Father-Daughter Album of Unspeakable Beauty." Both were released at Comicon SD 2013.
Outside of Adventure Time, Martin Olson is a "journeyman writer" in many fields—as comedy writer, television producer, author, stage director and composer. He is also a playwright and poet known for comedic and unusual subject matter. Olson is best known as a "founding father" of the Boston comedy scene, as a collaborator with comedians, animators and composers, and as a writer-producer of off-beat comedy. He also played the Chief in SpongeBob SquarePants.