Yash Patel

Yash M. Patel is the Co-Founder and CEO of Legion Health, a San Francisco-based AI-native mental health platform that delivers insurance-covered psychiatric care via telehealth. A Princeton mathematics graduate (2018) and Y Combinator alum (S21), Yash previously worked as a healthcare policy analyst at the Congressional Budget Office and as a research assistant at Harvard Medical School. Motivated in part by his experience caregiving for his father, he co-founded Legion Health in 2021 alongside Princeton classmates Arthur MacWaters and Daniel Wilson. The company has raised over $10M, and in April 2026 became the first startup to receive regulatory authorization to let AI prescribe psychiatric medications.