- A founding member of the Casitas Group, a Los Angeles theater company.
- Cofounder of Shakespeare on the Subway, a guerilla theater project in New York City.
- Starred in the 2010 independent film Consent, written and directed by his father, Ron Farrar Brown; Peter recalls that, growing up, the word "theater" was always in the vocabulary at home.
- Provided the voice of Gary Smith in the video game Bully.
- Plays classical guitar.
- Enjoys the challenge of playing comedy in MTV's I Just Want My Pants Back and notes that "comedy is harder than drama in a way" though drama tends to draw more of what he calls "highbrow respect."