Meet Our Team
Physician-Led Longevity Care
Together, we deliver a fully integrated, physician-led approach that helps you understand your health, optimize performance, and make decisions guided by evidence. Care is delivered collaboratively under direct physician leadership to ensure precision, continuity, and long-term outcomes—all with the shared goal of extending healthspan and preserving quality of life.
Cassie Hajek, MD
Dr. Hajek is a nationally recognized leader in preventive and personalized medicine, bringing deep expertise in longevity and advanced diagnostics to our region. She completed her Internal Medicine residency at Montefiore Medical Center and a Medical Genetics fellowship at UCLA, and previously led innovative genomic programs that integrated advanced genetics into patient care. She currently serves as Medical Director at Helix, applying her expertise to help individuals understand their biology, reduce disease risk, and optimize long-term healthspan through precision, physician-guided care.
Ember Smith, PT, DPT
Ember is a movement specialist with training in physical therapy and exercise physiology, leading the Movement and Performance pillar at Healthspan. She is the founder and owner of Well Balanced PT and specializes in orthopedic and pelvic health rehabilitation and longevity-focused fitness, integrating strength and mobility training and movement quality to support performance, long-term musculoskeletal health, and resilience across the lifespan.
Annie Ailts, MS, RDN
Annie is a registered dietitian with extensive experience in functional nutrition. She previously led the functional nutrition program at Avera for seven years and now serves as the lead dietitian for Healthspan’s nutrition pillar, guiding personalized, evidence-based strategies that support metabolic health, longevity, and sustainable lifestyle change.
Katlyn Nelson, RN, BSN & Jillian Augustad, RN, BSN
Katlyn and Jillian are experienced nurses at Healthspan, bringing expertise in longevity and functional medicine. They support patient care across all pillars, ensuring continuity, coordination, and a high-touch experience that empowers individuals to engage confidently in their long-term health optimization journey.
Advisory Board
Our team is backed by a network of experts and specialists to optimize the cutting-edge care we provide.
Daniel Terveen, MD
Ophthalmology
Marnie Terveen, MD
Gynecology and Women’s Health
Drew Messerschmidt, MD
Cardiology
Molly Uhing, MD
Gynecology and Women’s Health
John Berdahl, MD
Biotech Entrepreneur
Vance Thompson, MD
Surgeon and Researcher
Heidi Greenwood
Kinesiologist and Personal Trainer
Tamme Berdahl
Meditation and Breathwork Coach