Jack Dorsey is well known among tech circles, as a co-founder of Twitter (he's @Jack) and, now, as the CEO of Square. I'm a frequent Twitter user (I'm @MarkGraban) and I also utilize the Square reader occasionally to sell a book to somebody. I appreciate being able to easily and inexpensively accept a credit card here and there.This interview on the public radio program Marketplace caught my eye (I mean, ear):
Jack Dorsey: Twitter co-founder, Square CEO, punk
