About

Dr. Dawn Mussallem, DO, DipABLM, was appointed Chief Medical Officer of Fountain Life, a premier longevity company, in December 2025. Previously a renowned Mayo Clinic consultant in hematology/oncology and a double board-certified lifestyle medicine specialist, she leads Fountain Life’s efforts to advance AI-driven, proactive, and preventive health strategies. Her professional mission is deeply shaped by her own extraordinary health journey. She had a stage IV cancer diagnosis three months into medical school, followed by a life-restoring heart transplant in 2021. In a landmark achievement, she became the first person in the world to run a full marathon one year after a heart transplant, embodying the principles of recovery, regeneration, and peak performance that she teaches.

Key Details About Dr. Dawn Mussallem at Fountain Life:

• Role & Mission: As CMO, Dr. Mussallem drives the company’s mission to optimize healthspan and lifespan through cutting-edge diagnostics and personalized, evidence-based, and holistic, lifestyle-focused care.
• Background: She spent over 25 years at the Mayo Clinic, where she focused on cancer prevention, survivorship, and integrative oncology.
• Expertise: She is a recognized leader in lifestyle medicine, having founded the Mayo Clinic Florida’s Lifestyle Medicine Residency Curriculum.
• Focus: She emphasizes shifting from reactive to proactive, data-driven, and human-centered care. 

Dr. Mussallem also serves as a scientific advisor to multiple organizations spanning lifestyle medicine, nutrition science, and health innovation, and is active in community and systems leadership including the Blue Zones Project Jacksonville Steering Committee and the Food Policy Council.