Emily Mortimer is perhaps best known for her role as MacKenzie McHale in Aaron Sorkin’s beloved HBO series “The Newsroom.” Some of her other memorable performances are in Woody Allen’s “March Point,” Martin Scorsese’s “Shutter Island” and “Hugo” and as Phoebe, Jack Donaghy’s love interest, on the NBC series “30 Rock.” In this hour she talks extensively about one particular, powerful scene in her breakout film, Nicole Holofcener’s “Lovely & Amazing” (which earned her an Independent Spirit Award for Best Supporting Actress), and about what it was like to play a character named “Emily Mortimer” in her HBO series “Doll & Em.” Plus, of course, we talk SORKIN. And before you run to see Ms. Mortimer in the eagerly anticipated “Mary Popins Returns” at the end of the year, be sure to catch her in the charming Isabelle Coixet film “The Bookshop,” opposite Bill Nighy and Patricia Clarkson, this Summer.