Sarah (Warner) Harms is vice president of ad marketing and measurement at Roku, where she is responsible for the overall strategy and execution of the marketing and measurement efforts across the advertising business. Prior to Roku, Sarah spent five years at Microsoft/Xandr, where she ran the national sales and account management teams for the buy-side ad technology business. Sarah started and grew her career at WPP, working in business development, partnerships, investment and strategy across digital, video and programmatic channels.