Sarah Armstrong is a McKinsey master expert who leverages over 20 years of experience as a thought leader and practitioner in agency management. She has developed and implemented a range of agency models around the world, and leads McKinsey’s work in agency and partner management across media, creative, digital, design, promotions and experiential, and brand PR. As an adviser to marketing and marketing procurement leaders, Ms. Armstrong helps clients navigate the ever-changing and complex marketing agency ecosystem, creating models that maximize impact while developing win-win partnerships. In the area of agency compensation, Sarah is the architect for an approach to value-based compensation that is recognized globally as industry-leading. She is a frequent speaker at industry events globally on various agency management topics and has experience in providing leadership in areas within marketing operations, including marketing capability-building. Before joining McKinsey, Ms. Armstrong worked for 20 years in global marketing at The Coca-Cola Company, where she led worldwide agency operations across 200 countries. She was involved in leading The Coca-Cola Company’s approach to global media management—including media agency management—and global integrated marketing communications. Sarah started her career at Leo Burnett in Chicago, in media.