David Ko

David is the CEO of Calm, a leading app for sleep, meditation and relaxation, where he also serves on the Board of Directors. Prior to joining Calm, David was the co-founder and CEO of health tech company Ripple Health Group (which was acquired by Calm in 2022). Following the acquisition and under David’s leadership, the company launched Calm Health, a mental health care solution for payers, providers and self-insured employers designed to bridge the gap between mental and physical health care.

Before founding Ripple Health Group, David spent over a decade as a leading healthcare executive. He was a Board Member, President and COO of Rally Health, a digital health company. Rally’s solutions are available to nearly 55 million people through health plans, care providers, and more than 200,000 employers. Rally was acquired by UnitedHealth Group in 2017.  David was also the COO at Zynga, which he helped take public in December 2011. Prior to his work at Zynga, he spent 10 years at Yahoo! and currently serves on various boards at his alma mater, New York University Stern School of Business.

David is also the #1 Amazon bestselling author of Recharge: Boosting Your Mental Battery One Conversation at a Time, and has been featured in TIME’s Leadership Brief, named a LinkedIn “Top Voice” and one of RockHealth’s “Top 50 Leaders in Digital Health.”