Dawn Mussallem

Three months into medical school, Dawn Mussallem was diagnosed with stage IV cancer. The prognosis cast doubt over whether she would ever qualify as a doctor. But she survived, returned to her studies, and went on to build a successful career in oncology.

Today, Mussallem is Global Chief Medical Officer at Fountain Life, a preventive health organisation focused on early detection, lifestyle medicine and long-term vitality. She also serves as a medical advisor to IM8, the nutrition and longevity company co-founded by David Beckham.

In early 2026, Mussallem will be concluding more than 20 years at Mayo Clinic Florida where she founded the Integrative Medicine & Breast Health Programme. At Mayo, Mussallem played a central role in medical education, including the training of physicians in lifestyle medicine and breast health. She also held leadership roles focused on clinician wellbeing and the medical humanities — areas she argues are central, rather than peripheral, to good medicine.

Dawn Mussallem’s authority comes from an accumulation of evidence, practice and lived experience. Years later, the therapies that saved her life caused severe heart failure. In 2021, she suffered cardiac arrest and received a heart transplant. One year on, she ran a full marathon, becoming the first person to do so after transplantation.

However, Mussallem is wary of framing this as a story of personal triumph. What interests her more is what it reveals about modern healthcare: how often medicine intervenes too late, how poorly patients are supported after survival, and how rarely prevention is treated as a serious clinical discipline.

As a speaker, her talks draw on practical examples from breast medicine, oncology and lifestyle care: how nutrition shapes tumour biology; why alcohol remains an under-examined cancer risk; what actually helps patients regain strength, cognition and confidence after treatment; and where wellness culture drifts into distraction rather than benefit.