The news website Quartz has signed on to Concert, a digital ad marketplace created by Vox Media and NBCUniversal, the companies announced today. The new partnership allows for a vertical on Concert called, “Concert C-Suite” to reach top executives and, as the companies claimed, the ability to reach 86 million unique monthly visitors among brands… http://www.adweek.com/digital/quartz-joins-digital-ad-marketplace-concert-to-reach-top-execs/