Doug Zarkin, the Chief Marketing Officer of Pearle Vision, adds his page to the Marketing Playbook. Hear how to use effective listening to be an effective leader, how to make decisions based on data and other factors, how to leverage what you've learned for the next step of your career, how graduate business school compares to undergrad, and the differences in working for an agency vs. client side. Connect with Doug on LinkedIn and on Twitter at @DougZarkin