Physician(s) Name, Contact, Bio
Dr. Chris Renna, MD
A pioneer in preventive medicine, Dr. Chris Renna founded LifeSpan Medicine in 1992 with a mission to redefine healthcare. Frustrated with the limitations of traditional medicine, he developed a science-driven, patient-focused approach designed to optimize health, prevent disease, and enhance longevity.
Dr. Renna’s approach—built on cutting-edge diagnostics, functional medicine, and precision therapies—has positioned LifeSpan Medicine as the nation’s premier longevity and performance health provider. A published author and renowned speaker, he continues to lead advancements in functional and preventive medicine, ensuring that his patients receive the most progressive, results-driven care available.
Dr. Olivia Lesslar
Dr. Olivia is an Australian-educated and trained doctor with a passion for preventative medicine, integrative medicine. Dr. Lesslar’s approach to clinical care is comprehensive and customized evaluating the root cause of issues for each client. Her programs incorporate all treatment modalities and are tailored to each client’s goals from risk reduction to chronic illness improvement and biohacking. Her approach to patients is one of compassion and optimism.
She is a renowned international speaker having given talks on general health, phytochemicals, diabetes, atopy, mind-body connection, and cancer. Dr. Lesslar has worked with the Neuroimmunology Associates of New York and recently collaborated on neurodegenerative disease research with internationally-renowned neurologist Dr. Jay Lombard.
Dr. Lesslar has her medical degree from (MBBS) Bond University in Queensland Australia, after completing an undergraduate degree in International Relations with a triple major including French and diplomacy. She has certificates in remedial therapies including herbs, nutrition, and acupressure, and has an Advanced Certificate in Skin Cancer Medicine.
Dr. Karen Koffler, MD
Dr. Karen Koffler is a distinguished physician and trailblazer in integrative medicine, renowned for her commitment to providing comprehensive and compassionate care. With a wealth of experience and a passion for empowering clients to achieve optimal health, Dr. Koffler has become a respected figure in functional, integrative wellness.
Dr. Koffler earned her medical degree from the University of Miami. She is board-certified in Internal medicine and Integrative medicine. Her journey in medicine led her to specialize in integrative medicine, blending conventional and alternative approaches to address the root causes of health issues.
A true pioneer in the field, Dr. Koffler has dedicated her career to promoting the principles of integrative medicine. She seamlessly combines evidence-based conventional medicine with complementary therapies, emphasizing the importance of treating the whole person – mind, body, and spirit. Her approach aims to empower clients to actively participate in their health.
Dr Koffler was among the first physicians certified by the Institute for Functional Medicine. She is trained in acupuncture, Mindfulness-Based Stress Reduction, and by Dr. Dale Bredesen in the Recode Program to prevent and reverse dementia. She has training and expertise in nutrition, herbs, genomics, guided imagery, chi gong, yoga, and additional therapies.
In her extensive 20+ year medical career, she held numerous prestigious positions, including Medical Director of the Integrative Medicine Center at Evanston Northwestern Healthcare in Chicago, Medical Director of Canyon Ranch Miami Beach, Director of Functional Medicine at Rezilir Health, and most recently, Medical Director for the Osher Center for Integrative Medicine at the University of Miami.
Dr. Koffler maintains active memberships in professional organizations dedicated to integrative medicine, such as IFM, A4M, and others.
In addition to her clinical practice, Dr. Koffler is a passionate educator and mentor, sharing her knowledge with the next generation of healthcare providers. Her guidance inspires a new wave of professionals to embrace a holistic approach to care. Dr. Koffler has contributed to the field through various publications and articles, sharing her insights on integrative medicine, holistic wellness, and the mind-body connection. Her work has significantly impacted both the medical community and the general public.
Dr. Paris Whitney
Dr. Whitney is an accomplished, board certified functional medicine practitioner and board certified family physician. She completed her undergraduate degree at Texas A&M University and went on to complete her medical degree at University of North Texas Health Science Center with residency at UC Davis Medical Center/Mercy Methodist Hospital.
She began her 20+ year career as the medical director of IHS in California. Following this, she began her clinical journey into functional medicine and spent 10 years in private practice improving her clients health goals and preventing further decline.
Dr. Whitney moved on to Cleveland Clinic where she pioneered the functional medical program alongside world renowned physician Dr. Mark Hyman. While there Dr. Whitney pursued extensive training in fascial distortion modelTM (FDM) and frequency specific microcurrent (FSM). Dr. Whitney served as the clinical lead in developing a Functional Medicine Fellowship while training her Cleveland Clinic colleagues on how to perform FDM.
After leaving Cleveland Clinic, Dr. Whitney maintained a private concierge practice supporting clients in comprehensive, preventive, functional medicine programs. Her clients were made up of executives, their families and colleagues with interests of longevity, health and optimal function.
Dr. Whitney joined LifeSpan medicine in 2023 as a preventive, functional medicine physician. Her clinical care programs are made up of cutting edge comprehensive preventive longevity treatments as well as root cause functional medicine supporting optimal health and function.
She is a member of the AOA, ABOIM, IFM, AAFP, ABFM. Dr Whitney also has training and expertise related to cognitive decline, cardiometabolic advanced practice, environmental health, GI/microbiome, hormone balancing and immune support.
Dr. Melissa Sundermann
Dr. Melissa Sundermann is a dedicated and compassionate physician committed to providing exceptional care and comprehensive programs focused on mind/body optimization. With a strong background in both traditional and integrative medicine, Dr. Sundermann combines her expertise to offer a comprehensive and customized approach to healing, longevity, health, and function.
Dr. Sundermann earned her medical degree in Internal medicine from Michigan State University. She is double-board certified in Internal medicine and Lifestyle medicine. Dr Sundermann spent the first 10 years of her career in traditional internal medicine practice while learning and educating herself in functional and integrative medicine. Her commitment to lifelong learning and staying abreast of the latest medical advancements has fueled her passion for delivering cutting-edge and evidence-based care. In the last 10 years, she has practiced functional, integrative medicine for her clients at Integrated Health Associates and, most recently, Canyon Ranch in Lennox, Massachusetts.
Known for her cutting-edge holistic treatments and approach to healthcare, Dr. Sundermann understands the interconnectedness of physical, mental, and emotional well-being. She integrates traditional medical practices with complementary therapies to address the root causes of health issues, fostering a comprehensive healing experience for clients.
Dr. Melissa Sundermann is an active member in the medical community and a frequent speaker on wellness, longevity, health and aging. She is an active member of A4M, IFM and the American College of Lifestyle Medicine. In addition to her clinical practice, Dr. Sundermann actively engages with the community through health and wellness workshops, speaking engagements, and educational events.
Dr. Moshe Ben-Roohi
Moshe Ben-Roohi, M.D. specializes in advanced non-surgical orthopedics and regenerative treatments for sports injuries, degenerative joint disease, and conditions of the spine. He often works with clients who have tried everything else and failed.
He is double board certified in Physical Medicine and Rehabilitation (PM&R) and Pain Medicine. He obtained his medical degree at Tel-Aviv University’s Sackler School of Medicine and residency at NYU Medical Center and Hospital for Joint Diseases where he served as Chief Resident. After residency he completed a fellowship in Interventional Spine and Sports Medicine.
Dr. Ben-Roohi maintains his role in academic medicine through his continued pursuit of ongoing research. He has published numerous scientific papers in PM&R and other peer reviewed journals. He is a frequent speaker on the subjects of Sports Medicine, Pain Management and Molecular Orthopedics. Dr. Ben-Roohi is a member of the American Medical Society for Sports Medicine (AMSSM), North American Spine Society (NASS), International Spine Intervention Society (ISIS), International Cellular Medicine Society (ICMS), American Academy of Orthopedic Medicine (AAOM), Institute for Functional Medicine (IFM) and the American Academy of Physical Medicine and Rehabilitation (AAPMR).
Dr Mary Dohrmann
PHD-C, LPC, NCC, RPT™, C-PAT
Mary Dohrmann is a caring, experienced therapist passionate about bringing transformative healing to individuals and children in a private, comfortable, and safe environment. She supports each individual’s journey toward healing, wholeness, and self-discovery. She provides therapeutic experiences to all ages, cultures, and identities with the hope of empowering them to find their strength and a healthier, happier future.
Mary completed her undergraduate education at Colorado Christian University, her graduate degree from Regis University, and her Ph.D. in Counseling Education and Supervision. Mary also holds specialized training in psychedelic-assisted therapy, Ketamine, Psilocybin, and MAPS MDMA Therapy training. Mary is an active voice in policy formation and the introduction of psychedelics in the community. She is also an experienced herbalist and yoga therapist.