medical-chart-review
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David Sontag
David Sontag is the co-founder and CEO of Layer Health, a Boston-area startup building an AI layer that reads and abstracts messy medical charts at clinician-level accuracy. He is also a professor at MIT in EECS and IMES, a principal investigator at CSAIL, and a leader in machine learning for healthcare with more than 20,000 citations across roughly 140 publications. After a decade of academic research turning raw clinical data into predictions, he took partial leave in 2025 to scale Layer Health, which raised a $21M Series A led by Define Ventures.
Justin Liu
Justin Liu is the Co-Founder and CEO of Charta Health, a San Francisco-based AI healthcare operations company that automates medical chart review and billing/coding workflows. Having previously led growth at Rockset (acquired by OpenAI in 2024), Liu pivoted to healthcare, earning a Certified Professional Coder credential alongside his co-founder before raising over $30M to back their mission of making healthcare more affordable through AI. Charta Health's platform enables hospitals and health systems to review 100% of charts pre-billing, delivering an average 11% revenue uplift per chart.