Current & Incoming Primary Care Professional Development Physicians

Zachary C. Liao, MD, MPH, MS
2022 - 2024
Zachary C. Liao, MD, MPH, MS is an internist joining Atrius Health as a primary care physician in the PDP and as a medical director of informatics. Born and raised in Seattle, Zach earned his Bachelor of Science in Molecular Biophysics and Biochemistry at Yale University, followed by medical, Master of Public Health, and Master of Science degrees at the University of Washington. He completed internal medicine residency at the University of Miami/Jackson Memorial Hospital and clinical informatics fellowship at the University of Washington. His interests include population health, EHR interoperability, and machine learning.

Nathan Petrou, MD
2023 - 2025
Nathan Petrou comes to us after receiving his MD from the University of Massachusetts Medical School. During medical school, Nathan focused his extracurricular time on advocacy for vulnerable populations with extensive volunteer and leadership work at the Worcester Free Clinic Program, by caring for chronically ill children, and completing research on models of HIV care. Nathan has completed basic science research in cardiovascular medicine, contributed to a clinical trial analyzing the impact of a Mindfulness Based Stress Reduction (MBSR) program on physiologic parameters in subjects with an ischemic cardiomyopathy, and contributed to a guide on severe snake envenomation in The Rational Clinical Examination Education Guides. Nathan graduated magna cum laude with distinction from Kenyon College, with a BA in Molecular Biology.

Jonathan Fried, MD, MPP
2023 - 2025
Jonathan Fried joins us after receiving his MD from Harvard Medical School, and a Master of Public Policy from the Harvard Kennedy school of Government. At Harvard, Jonathan ran voter registration drives as vice president of HMS Citizen Physicians and served on the Harvard Center for Primary Care Student Leadership Committee. Jonathan has done research on the financial implications of primary care-based buprenorphine prescribing, assisted a health insurer create new payment models, and developed a quality measurement strategy for the Pennsylvania Rural Health Model. Before medical school, Jonathan worked at the Centers for Medicare & Medicaid Services, where he supported the Comprehensive Primary Care Initiative, a national effort to transform primary care. Jonathan completed his undergraduate degree at the University of Pennsylvania, where he received a BA in Political Science, and served as a Congressional Intern in the U.S. House of Representatives.