SSM Health Cancer Care Welcomes Radiation Oncologist Dr. William Dunn

Offering patients cutting-edge treatment options close to home

February 20, 2026 09:53 AM -

Mt. Vernon, IL – SSM Health Cancer Care in Mt. Vernon, Illinois, is proud to announce William Dunn, MD, a board-certified radiation oncologist, has joined SSM Health Medical Group. Dr. Dunn brings extensive experience in advanced radiation oncology techniques, including Intensity Modulated Radiation Therapy (IMRT), Stereotactic Radiosurgery (SRS), Stereotactic Body Radiation Therapy (SBRT), and Image Guided Radiation Therapy (IGRT), offering patients modern radiation treatment options close to home.

Dr. Dunn has served in leading cancer centers across the Midwest and brings a patient-centered approach to care, specializing in the treatment of complex cancers with precision and compassion. With over 20 years of experience treating breast, brain, lung, head and neck, colon, prostate, and skin cancers, Dr. Dunn is committed to delivering personalized, compassionate care. He is fluent in Spanish and French, which allows him to connect with patients from diverse backgrounds. Dr. Dunn is a veteran who served for many years as a Lieutenant in the United States Navy.

“We are thrilled to welcome back Dr. Dunn to SSM Health Cancer Care in Mt. Vernon. His extensive expertise and commitment to patient-centered care will further strengthen our ability to deliver exceptional, compassionate treatment to the community,” states Jenny Sims, Director of Practice Management for SSM Health Medical Group in Southern Illinois. “This addition reflects our ongoing dedication to providing quality advanced cancer care close to home.”

For more information about Dr. Dunn and the comprehensive cancer care services available at SSM Health, please visit www.ssmhealth.com/doctors.

About SSM Health

SSM Health is nationally recognized for quality and innovation. It is a Catholic, not-for-profit, fully integrated health system working to advance health equity and empower all people to achieve their full potential.

With care delivery sites in Illinois, Missouri, Oklahoma, and Wisconsin, SSM Health provides convenient access to high-quality community-based services as well as world-class academic medicine, clinical trials, and research studies. The organization’s footprint includes hospitals, physician offices, outpatient and virtual care services, senior care, comprehensive home care and hospice services, a fully transparent pharmacy benefit company, a health insurance company, and an accountable care organization.

As one of the largest employers in every community it serves, the organization’s 40,000 team members and 15,000 providers are dedicated to fulfilling SSM Health’s Mission: “Through our exceptional health care services, we reveal the healing presence of God.”

For more information, visit ssmhealth.com or find us on Facebook and LinkedIn.

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