For much of the cast of "Severance," the show is the culmination of years and years of hard work in the trenches of Hollywood, plugging away at one show or movie after another until "Severance" came along to finally give them their big break. But for John Turturro, who plays the soft-spoken MDR employee Irving B., "Severance" is just one more credit in a long and industrious career. He got his first film role as a non-speaking extra in Martin Scorsese's "Raging Bull," and since then, Turturro has worked with some of the other greatest directors of his generation. From...