He has released a line of action figures of Good Charlotte which can be found on ebay.
He has one younger sister, named Sarah. She was the photographer who did Good Charlotte's first photo shoot.
His parents are divorced, but he is close to them individually.
He had dread locks during high school, but when Good Charlotte signed on with Epic records, they wouldn't sign the band unless he cut his hair.
He was well liked at school because of his nice-guy personality.
He attended Severna Park High School.
His favorite movies are The Nightmare Before Christmas and Who Framed Roger Rabbit.
His musical influences include Silverchair, Michael Jackson, Incubus, Deftones, Lit, Linkin Park, Orgy and KoRn.
His favorite foods are peanut butter and bean burritos.
His eye color is blue.
He considers Elton John and Tim Burton his idols.
He received his first guitar as a Christmas present.
He is currently working on a picture book with action figures.
While recording Good Charlotte's third album The Chronicles of Life and Death, he and Benji Madden switched guitar roles.
He is a huge animal lover and is active in the animal rights organization PETA (People for the Ethical Treatment of Animals).
He co-wrote "Mountain" and "Ghost of You" off of The Chronicles of Life and Death CD.
He designed all the artwork for the videos "Predictable" and "The Chronicles of Life and Death."
He produced 8 out of 11 tracks on the tHrOne CD "Balladry".
He has many tattoos and piercings.
He is an accomplished artist, and has a website for all of his art.
He plays Paul Reed Smith (PRS) guitars, Mesa Boogie Amps, and BOSS Effect Pedals.
He was formerly the lead singer/guitarist for a band called Overflow, which he started with his friend JD, and Steve Sievers.
He owns the clothing line LeVeL 27, which his friend Steve Sievers helps him run.
He is a vegetarian. He also convinced fellow Good Charlotte members Joel and Benji Madden to become vegetarians.
He is the guitarist and keyboard synthesizer for the band Good Charlotte.
He dated his ex-girlfiend Linzi since high school, but they recently broke up, stating that they were still friends.
He is 6' 1" in height.
Billy: I'm scared of cops. I'm a goody goody. I never do bad things.
Billy: I don't know what I had for breakfast today. It was like... something with wood. I don't know.
Billy: I like to hang outside and meet new friends, otherwise I'd be in the dressing room right now all bored and stuff.