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Mary "Muff" Heffernan, ARNP

Mary J. Heffernan, AOCNP, ARNP, MN

Schedule an Appointment

To schedule an appointment with Mary J. Heffernan please call 425-688-0212.

Accepting new patients.


Year joined staff:


  • Breast Surgery



Seattle University, Bachelor of Science, Nursing
University of Washington, Master of Nursing


In the March 2015 issue of ONS Connect, The Official News Magazine of the Oncology Nursing Society featured the Cancer Survivorship program Mary ‘Muff’ developed at Overlake Medical Center. Check it out!

Born and raised in the Seattle area, Mary "Muff" enjoys a variety of outdoor activities with her husband Dan and two children, Maureen and Riley.

Currently participating in a two year teaching grant sponsored by the Bristol Myers Squibb Foundation with the University of Washington School of Nursing and the Bashkortostan Medical State University in Russia. In October 2014, she completed the second phase of training oncology nurses for the Russian Nurses Association. They conducted a five day workshop including 43 nurses who were sponsored by their medical centers to attend. The focus was to provide evidence-based oncology symptom management strategies for the nurses. They will in turn, bring the information learned back to their medical centers. Muff says, "It was a wonderful trip and a reminder of how fortunate we are in the United States and in particular, Overlake, to be able to have the resources to provide such high quality care for our patients, every day."

Practice Philosophy

Treat each patient with the same level of care and concern as I would for a member of my family.

Board Certification

Adult Nurse Practitioner, American Nurse Credentialing Center, 2009

Advanced Oncology Certified Nurse Practitioner (AOCNP),  2011

Clinical Interest

Breast Cancer Surgery, Benign Breast Disease, High-Risk Screening, Breast Cancer Survivorship.

Teaching or Professional Positions

University of Washington School of Nursing, Affiliate Faculty

Professional Memberships

American Academy of Nurse  Practitioners, Oncology Nursing Society

Office Information

Provider's Contact Information

  • Office Phone: 425-688-0212
  • Fax: 425-688-0213

Overlake Medical Clinics Breast Surgery