Peter Mastne is best known for his work as various law-enforcement character on Film and Television. He had recurring roles on ID's hit show Homicide Hunter as Det. Skip Arms and on Oxygen's Buried in the Backyard. He's also had Guest starring roles on numerous other shows for Hulu, Peacock, HBO, CNBC, A&E and the History Channel. Additionally, he has multiple film credits in both lead and supporting roles.

He studied acting at Second City Chicago and Playhouse West LA.