Seward and editor-in-chief Katherine Bell partner to take Quartz private Quartz co-founder and CEO Zach Seward has reached an agreement to acquire Quartz from Uzabase, the company’s owner for the past two years. Seward, who remains CEO, is partnering with editor-in-chief Katherine Bell, now a minority owner, to operate Quartz as a private company. The acquisition is effective immediately. …