An American actor and musician, he is best known as one half of the comedy rock duo Tenacious D alongside Jack Black. He was born in Castro Valley, California, and developed his love for performance early on. A graduate of UCLA's School of Theater, Film and Television, he has appeared in various films and television shows, often bringing his comedic flair to roles. Beyond acting, he is an accomplished guitarist and has contributed significantly to Tenacious D's musical success.