For some time now I have wanted to tell you about James Stengel. And now I will since he has just been named Managing Editor of “Time” magazine. I interviewed Stengel when he was still the boss at the National Constitution Center in Philadelphia. Here’s a slightly edited version of that interview: JL: Why don’t you begin by telling us a little bit about yourself. RS: Well, I am now president and CEO of the National Constitution Center, this fabulous institution on Independence Mall in Philadelphia. I came directly here from TIME magazine, where I was the national editor in...