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 is an internist joining Atrius Health as a primary care physician in the PDP. Born and raised in Massachusetts, Nate earned his BA in Molecular Biology from Kenyon College and received his MD from University of Massachusetts Medical School. He then completed internal medicine residency at Brigham and Women's Hospital in the Atrius Health Primary Care and Population Medicine Program, during which he participated in the Leadership for Health Equity Pathway. His interests include improving coordination between primary and specialty care, optimizing the referral process, and digital health.

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.