Dan John Miller is an American actor and musician. In the Oscar-winning "Walk the Line", he starred as Johnny Cash s guitarist and best friend, Luther Perkins, and has also appeared in George Clooney s "Leatherheads "and "My One and Only", with Renee Zellweger. An award-winning audiobook narrator, Dan has garnered multiple Audie Award nominations, has twice been named a Best Voice by "AudioFile "magazine, and has received several AudioFile Earphones Awards and a Listen-Up Award from "Publishers Weekly".