Personalized Medicine to Live a Long, Healthy Life
At Longitude, we believe living longer should also mean living stronger, sharper, and healthier. We bring together cutting-edge medical therapies, the latest in longevity science, and practical lifestyle changes to help you optimize your body and mind for the long haul. Aging isn’t just about adding years—it’s about making those years full of energy, clarity, and strength.
Our approach goes beyond the basics. We help improve cognition, emotional well-being, fitness, strength, metabolic health, and gut health while addressing the core hallmarks of aging. Whether you want to boost energy, enhance recovery, balance hormones, or improve mental sharpness, we tailor our treatments to your unique needs. From IV therapy and weight loss peptides to hormone optimization and performance-focused health plans, we use the best tools available to help you feel and function at your best.
At Longitude, longevity isn’t just a concept—it’s a reality we help you build. If you’re ready to take control of how you age and unlock your full potential, we’re here to guide you every step of the way.
Meet the Team
Peter Miller
Co-Founder, CEO
Peter Miller’s journey into longevity and health optimization began with a personal wake-up call—a surprise diagnosis of severe type-2 diabetes. Unwilling to accept a future of declining health, he took control, reversing the disease through a complete lifestyle transformation. By losing 65 pounds, embracing cutting-edge science, and rethinking everything he knew about health, Peter discovered firsthand the power of proactive, preventative medicine. With a background in guiding some of the world’s largest companies through transformation, Peter brings a fresh perspective to the healthcare space. He saw an industry focused on managing sickness rather than optimizing health—and he knew it could be different. That vision led to Longitude Health, a clinic built on the idea that longevity isn’t just about living longer, but living better. Under his leadership, Longitude Health is redefining what’s possible, helping people take control of aging, vitality, and long-term wellness.
Dr. Zachary Ditmarsen, D.C.
Co-Founder, Clinic Chief
Dr. Zach first developed an interest in becoming a chiropractor when it was the only method that helped his mom find relief after a bad car accident. Combined with his fascination with the nervous system from 11th-grade anatomy class and first-hand experience with knee and shoulder pain from athletics, Dr. Ditmarsen found his path to a career in chiropractics.
Dr. Ditmarsen attended St. Cloud State for pre-med and received his Doctor of Chiropractic at North Western Health Sciences University, both in his home state of Minnesota. Dr. Zac stays active in the chiropractic community by staying current and up to date with the latest research and new forms of treatment.
Dr. Brandon Miller, D.O.
Medical Director
Dr. Brandon Miller is an anesthesiologist with nearly two decades of experience and a passion for longevity-focused medicine. His extensive background in biochemistry provides him with a deep understanding of the molecular and physiological processes that drive aging, allowing him to develop targeted strategies to slow decline and optimize health. Dr. Miller is dedicated to helping patients maintain homeostasis, enhance resilience, and extend healthspan through advanced therapies, including hormone optimization, metabolic support, and cellular rejuvenation. A graduate of Kansas City University College of Osteopathic Medicine in 2008, Dr. Miller has spent years refining his expertise in both traditional and regenerative medicine. He is affiliated with Saint Joseph Hospital and Lutheran Medical Center. At Longitude Health, he applies his knowledge and experience to help individuals take control of their aging process and achieve peak vitality at any stage of life.
Katie Keinath, NPRN
Nurse Practitioner
Katie Keinath is a board-certified Acute Care Nurse Practitioner with a decade of experience specializing in critical care and trauma surgery. She is passionate about empowering patients to take an active role in their health through personalized, preventative, and lifestyle-based approaches. Katie believes in treating the whole person—mind, body, and lifestyle—to promote long-term wellness. Outside of work, Katie enjoys strength training at the gym, exploring the outdoors with her two-year-old, hiking, and biking. A devoted dog lover, she’s happiest when she can combine fresh air, family time, and movement.
Alayna Hayes
Director of Client Care
Alayna Hayes’s passion for helping people thrive began during her time at Florida State University, where she earned a degree in Business and discovered the impact that strong relationships and thoughtful leadership can have on individuals and organizations alike. Over the years, she has built a career guided by a commitment to understand people’s needs and find answers that make a difference. Known for her ability to blend strategic insight with genuine care, she approaches each interaction with a focus on building trust, fostering clear communication, and ensuring every client feels valued and supported. As Director of Client Care, Alayna is dedicated to making sure each person’s journey with Longitude is both seamless and empowering, reinforcing the company’s mission to help people live longer, healthier lives.
Contact us
Email: Hello@LongitudeLife.com
Phone: (615) 628-7220
291 Rich Circle, Franklin TN 37064