LifeSpan medicine

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. Kharbat 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 Kharbat moved on to Cleveland Clinic where she pioneered the functional medical program alongside world renowned physician Dr. Mark Hyman. While there Dr. Kharbat pursued extensive training in fascial distortion modelTM (FDM) and frequency specific microcurrent (FSM). Dr. Kharbat 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 Kharbat 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 Kharbat 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 Kharbat also has training and expertise related to cognitive decline, cardiometabolic advanced practice, environmental health, GI/microbiome, hormone balancing and immune support.

Dr. Melissa Sundermann, DO, DipABLM, FACLM

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. Karen H. Knight M.D.

Dr. Karen Knight is a leading specialist in regenerative, non-surgical orthopedics and is recognized by her peers as a top doctor in spine and musculoskeletal medicine. Dr. Knight is board-certified in PM&R and a fellow of the American Academy of Physical Medicine and Rehabilitation.   She has additional qualifications in Pain Management, Integrative Medicine, Sports Medicine, Mind/Body medicine and continues to seek out cutting-edge training in diagnostics, nonoperative interventional orthopedics, pain and regenerative medicine. 

Dr Knight completed her undergraduate degree at the University of Michigan and medical school at Michigan State University College of Human Medicine. She then returned to the University of Michigan, where she completed her Physical Medicine and Rehabilitation residency. She subsequently joined the faculty at Case Western Reserve University and served as an Attending Physician with the Department of PM&R at MetroHealth Medical Center and then at Louis B. Stokes Veterans Administration. Dr. Knight spent the last 13 years at Panorama Orthopedics in private practice.  During this time she explored her interest in the connection between pain and neurology leading to additional training and expertise in Ketamine Therapy, Psychedelic assisted therapies and MAPS MDMA Training.

Nicole Visnic, MS, CCN

Nicole Visnic is the Director of Nutrition for LifeSpan medicine and a seasoned clinical nutritionist with a proven track record of helping clients achieve their health and performance goals. She has worked with thousands of clients on topics ranging from optimizing body composition to health complaints like fatigue and digestive issues. She uses customized nutrition and lifestyle programs along with innovative motivational strategies to help her clients adhere to their programs and feel their best.

Nicole has also spent a portion of her career working with professional athletes spanning across leagues such as the NFL, NBA, and MLB, as well as helping athletes prepare for the Olympics. Her nutritional approach is designed to keep athletes as durable, resilient, and healthy as possible under intense training demand.

She earned her Bachelor’s Degree in Health Education from Winona State University and her Master’s Degree from the University of Bridgeport in Human Nutrition and is a Certified Clinical Nutritionist.

Rachel Swanson, MS, RD

Rachel Swanson is a leading nutritionist at LifeSpan medicine specializing in individualized nutrition programs focused on optimum health, detoxification, weight loss, performance and peak physical function. She holds a masters in nutrition as well as a registered dietetic degree from NYU. Rachel began her accomplished career with the New England Patriots providing team nutrition programs focused on optimization of player health and team performance. She launched her private practice in nutrition consulting for different organizations and projects at Harvard, several nutraceutical companies and private physicians.

Rachel has worked with a broad range of individuals from celebrities, professional athletes to business professionals and moms, dads and families of all ages.  Her experience in dietetics and private practice have provided experience and expertise in a wide range of health issues and nutritional program to optimize health and prevention or manage disease such as cardiovascular disease, diabetes, weight loss/gain, anti-inflammatory diets, gastrointestinal health, chronic disease prevention, skincare/anti-aging, and sports nutrition. 

She is passionate about her work and 100% committed to helping each and every client succeed. Her current practice focuses on nutrition counseling, customized programs and nutritional education.Rachel is a renowned speaker and contributor to media and events like TechCrunch, FounderMade, Huffington Post, Dr Oz and more. Rachel holds memberships in multiple professional organizations such as California Academy of Nutrition and Dietetics, Dietician in Integrative and Functional Medicine, and American College of Sports Medicine.