Producer Colin Callender is known for his excellent taste and strong relationship with stars, but he's also been an innovator in the financing and distribution of international co-productions. After more than 20 years with HBO, Callender launched Playground in 2012. The company has a big presence in TV this year with the adaptations of “Howard’s End” for Starz and the BBC, “King Lear” for the BBC and Amazon, and “Little Women” for the BBC and PBS. Here he discusses the ins and outs of international co-productions and his work in theater, which includes Broadway smash “Harry Potter and the Cursed Child.”