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Gary An, MD, FACS

Professor of Surgery
Co-Director, Surgical Intensive Care Unit

Gary An, MD, is a general surgeon with an expertise in surgical critical care, trauma surgery and acute care surgery. In addition to being an active clinician, he is a senior fellow of the Computation Institute at the University of Chicago. Dr. An is a founding member of the Society of Complexity in Acute Illness (SCAI) and both past president and current board member of the Swarm Development Group, one of the original organizations promoting the use of agent-based modeling for scientific investigation.

Dr. An's research looks to harness the power of big data toward better surgical care. He has worked on the application of complex systems analysis to sepsis and inflammation since 1999, primarily using agent-based modeling. His research involves the development of mechanism-based computer simulations in conjunction with biomedical research labs, high-performance/parallel computing architectures for agent-based models, artificial intelligence systems for modular model construction, and community-wide meta-science environments, all with the goal of facilitating transformative scientific research.

Practice Location

University of Chicago Medicine
5841 S. Maryland Avenue
Chicago, IL 60637

Year Started Practice


Board Certifications

General Surgery
Surgical Critical Care

Medical School

University of Miami

Internship & Residency

Cook County Hospital, University of Illinois, Chicago


John H. Stroger, Jr. Hospital of Cook County


American College of Surgeons
Association for Academic Surgery
Shock Society
Complexity in Acute Illness
Surgical Infection Society
Chicago Metropolitan Trauma Society
Society of Critical Care Medicine

Language Spoken



Office Phone

(773) 834-2482

Office Fax

(773) 702-5050

Office Postal Address

Gary An, MD
University of Chicago Medicine
5841 S. Maryland Avenue, MC 5033
Chicago, IL 60637

Physician Photo

Clinical Interests

  • Trauma surgery
  • Acute care surgery
  • Surgical Critical Care

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Selected Publications

View a partial list of Dr. An's publications through the National Library of Medicine's PubMed online database.