LinkedIn: [john-treanor-74501898](http://www.linkedin.com/in/john-treanor-74501898)
Professional Overview
John C. Treanor, MD, is a board-certified diagnostic radiologist affiliated with Northwestern Medicine, specifically practicing under the Radiology Subspecialists of Northern Illinois. His primary specialty is Diagnostic Radiology. He holds staff appointments at both Northwestern Medicine Central DuPage Hospital and Delnor Hospital in the Winfield, Illinois area.
Dr. Treanor operates as an independent practitioner within the Northwestern Medicine Physician Network and is not an employee or agent of Northwestern Memorial HealthCare or its affiliated entities. His professional practice does not include seeing patients in a traditional outpatient office setting, indicating a focus likely on hospital-based radiological services or specialized diagnostic imaging workflows.
Education and Training
- Medical Degree (MD): University of Illinois at Chicago College of Medicine, 1984
- Internship: University of Illinois College of Medicine at Chicago (Metropolitan Group), 1985; St. Marys Health Services, 1986
- Residency: Advocate Health Care, Advocate Illinois Masonic Medical Center, completed 1990
- Fellowship: NorthShore University Health System, completed 1991
Board Certification
- American Board of Radiology – Certified in Diagnostic Radiology
Institutional Affiliations
- Radiology Subspecialists of Northern Illinois (Medical Group)
- Northwestern Medicine Physician Network
- Medical Staff at:
- Northwestern Medicine Central DuPage Hospital
- Delnor Hospital
Location
- Based in Winfield, Illinois, with clinical operations at Northwestern Medicine Central DuPage Hospital (25 N Winfield Rd, Winfield, IL 60190).
Professional Attributes and Recognition
- Over 41 years of medical experience since medical school graduation (1984).
- Recipient of multiple hospital awards, including a Patient Safety Excellence Award™ in 2025.
- Holds certification from the American Board of Radiology reflecting adherence to professional standards in diagnostic radiology.
- Maintains compliance with Northwestern Medicine’s policies on professional integrity and disclosure of external relationships relevant to clinical research and patient care.
Practice Characteristics
- Focused on diagnostic radiology services, likely including image interpretation and consultation within hospital settings rather than direct outpatient care.
- Affiliated with Radiology Subspecialists of Northern Illinois, indicating collaborative practice among radiology experts in the region.
- No ratings or patient reviews publicly available due to non-outpatient practice setting and Northwestern Medicine’s policy requiring a minimum number of patient experience surveys for public posting.
Research, Publications, and Achievements
- No detailed publicly available data on specific research publications, academic achievements, or recent professional recognitions beyond institutional awards as of the latest information.
- External links indicate a lack of clearly attributable academic publications or medical research authored by Dr. Treanor linked directly to his Northwestern Medicine role.
Summary
John C. Treanor, MD is a highly experienced, board-certified diagnostic radiologist serving Northwestern Medicine Central DuPage Hospital and affiliated facilities. His role is centered on hospital-based radiology services through Radiology Subspecialists of Northern Illinois. His extensive training and longstanding clinical experience, combined with recent recognition for patient safety, indicate a practitioner deeply embedded in clinical diagnostic operations with a strong commitment to safety and quality standards. Given his independent practitioner status and diagnostic specialty focus, his potential interests may align with advanced imaging technologies, hospital radiology workflow optimization, and patient safety initiatives within radiology services.
