NEW YORK (AdAge.com) -- In past jobs, Jim Harris has been a proponent of "hyper-local" marketing strategies that takes place in the lobbies of office buildings. So it's no surprise he's made that an anchor of the new Wall Street Journal Office Network. As CEO of that three-year-old company, he oversees a broadcast network of digital screens in more than 800 upscale office buildings in fifteen cities. And this past year, his company has posted a 100% increase in revenue and become a case study in how to boost sales by pairing digital screen ads with in-building product demos.