Brian Berger, the Founder and CEO of Mack Weldon, adds his page to the Marketing Playbook. Hear how to know when to change up your team, fulfill your various roles as CEO, continue to challenge yourself, what Brian learned from working at early Internet companies, and how Mack Weldon pivots while maintaining simple shopping. Connect with Brian at MackWeldon.com, on Twitter at @BBerger3, and on Instagram at @BrianBerger_