David Liu is the chief executive officer of Sonde Health. He is a business leader who has successfully launched, led and scaled companies and products in the consumer internet, education and healthcare technology industries. David most recently served as president and chief operating officer at Quartet, helping to scale it into a leading healthcare technology company that connects primary care physicians with mental health providers to improve overall health outcomes for patients. Before Quartet, David was president and chief operating officer at Knewton, where - from an early stage - he helped to build a leading global education technology company that uses machine learning to create personalized digital textbooks that improve student learning outcomes. David began his technology career with a decade at AOL Inc., where he was senior vice president and general manager leading multiple product areas, including instant messaging, and launched the original AOL.com portal as an internal start-up. David began his career as an automotive engineer for General Motors. David recently served as an entrepreneur-in-residence at Weill Cornell Medicine (WCM), where he evaluated developing technologies in therapeutics, diagnostics, devices and digital healthcare. He is an advisor to and investor in several technology start-ups. David received a BS in Industrial Engineering from Purdue University and an MBA from Columbia Business School.