In addition to being a series regular on Providence, Peterson had the recurring role of Nate Westen, brother of lead character Michael Westen. He had leading roles in independent features Sedona (2011) and Hate Crime (2005). Other roles include the Hallmark Entertainment Movie of the Week: Hard Ground (2003), in which Peterson co-starred as Burt Reynolds's son, Joshua; Godzilla (1998) and Can't Hardly Wait (1998). Notable television guest star roles include such series as NCIS (2003) playing Thomas Pierce in Season 9, episode "Devil's Triangle", "Charmed (TV series) (2003) playing The Beast/Derek in Season 6, episode "Little Monsters ",CSI: NY (2004) in the role of Henry Willens, in Season 4's episode of "Boo" and CSI: Crime Scene Investigation (2000) as Perry Haber in Season 7's "Burn Out" on CBS.