There are few names in the investment world, more recognizable than Bill Gross. The so-called bond king reinvented the way investors think about debt. For years, he's been a staple in the pages of Barron's and he sat on our annual roundtable of top investors.

But Barron's latest Gross story by senior writer Mary Childs comes with a twist-how the bond king became the world leader in stamps. This week on The Readback Mary joins us to talk about the latest chapter in her ongoing coverage of Bill Gross. In addition to her daily Barron's coverage, Mary is currently finishing up a book on Gross. So there's no one better to discuss the bond king.