David Liu is CEO of Sonde Health, a company using vocal biomarkers to assess patient health, wellness, and fitness. The company is white labeling its solution for app developers with initial products for respiratory and mental health problems.  In the interview, Liu discusses the product, technology, and key markets serving as the first adopters. These include healthcare providers and payers along with one industry I wasn't expecting.  Liu has been CEO of Sonde Health since 2019. He previously was chief operating officer at Quartet Health and education technology company Knewton and was a senior vice president at AOL. He earned an engineering degree from Purdue and an MBA from Columbia.