Peter Hermann lived in Germany until he was age 10. He was later educated at Yale University.

He met his wife Mariska Hargitay, on the set of Law & Order: Special Victims Unit (1999).

Before becoming an actor, Peter taught ESL and Special Ed as part of Teach For America Program. After that, he became a fact checker at Vanity Fair.

He speaks four languages: English, German, Spanish, and French.