Ian Bohen. Actor: Yellowstone. Ian Stuart Bohen is an American actor best known for his role as Peter Hale in MTV's Teen Wolf and as Ryan in Paramount Network's drama series Yellowstone. Bohen also appeared in a recurring role as Roy Hazelitt AMC's Mad Men. Bohen was born and raised in Carmel, California. He began his film-acting career in 1993, making his debut in Todd Field's AFI Conservatory project, Delivering....