Our Team
Meet our Team
A practice is only as good as its team. And at The Longevity Health Institute, we have one of the best teams in the country. Each one of our practitioners and admin staff brings years of expertise to the table. We’re excited to meet you. Now, you have the chance to learn more about us. We’re excited to meet you!
Dr. James Lewerenz, D.O, F.A.A.R.M
Dr. James Lewerenz is a Board Certified Physician in Family Practice. He did his residency in Family/General Practice and Emergency Medicine at Garden City Hospital, Beaumont Hospital, and Henry Ford Hospital. He received his degree of Doctor of Osteopathic Medicine at Kirksville College of Osteopathic Medicine (now known as A.T. Still University) in Kirksville, Missouri. He is an active staff physician at Beaumont Hospital, Botsford Hospital, and St. John Hospital. Dr. Lewerenz is an Assistant Clinical Professor at MSU, and an active member of American Academy of Anti-Aging and Restorative Medicine, American Academy of Osteopathic Medicine, American Medical Association, and American College of Osteopathic Physicians.
Dr. Ryan R. Abboud D.O
Dr. Ryan R. Abboud is a dedicated Doctor of Osteopathic Medicine with a deep-rooted commitment to holistic wellness. Specializing in Cardiovascular Prevention and Lifestyle Medicine, he brings a wealth of knowledge and experience to his practice, blending evidence-based practices with holistic approaches from Functional and Integrative Medicine.
Dr. Ryan is Board Certified in Family Medicine, and achieved his medical degree from Michigan State University – College of Osteopathic Medicine in 2017. He supplemented training through the Institute of Functional Medicine and has obtained a Certificate in Population Health from the University of Michigan – School of Public Health.
For the past several years, Dr. Abboud has been dedicated to a unique path as a concierge doctor, focusing on heart attack and stroke prevention. This experience has enriched his understanding of personalized care and preventative measures, shaping his approach to patient-centered health.
Beyond his formal education and credentials, Dr. Abboud’s belief in the power of food as medicine is a cornerstone of his practice. With a focus on optimizing metabolic function, he empowers patients to make informed choices that contribute to their overall well-being.
Dr. Abboud’s commitment extends to mental health, where he explores the potential of natural plant medicines, and meditative techniques, and employs medicine-assisted therapies. He envisions a world where individuals achieve balance within their environment and peace within their mind, body, and soul.
His personal interests include sauna, spending time in nature, camping, playing soccer, and spending time with friends and family, especially with his fiancé Helaina. With a profound respect for the beauty of existence, Dr. Abboud aims to guide his patients toward self-discovery, truth, and self-optimization.
Lauren Ross, FNP-BC
A Nurse Practitioner, has been working with Dr. Lewerenz for 5 years now. After earning her undergraduate degree from Western Michigan University, she worked for multiple teaching hospitals including Royal Oak Beaumont, Northwestern Memorial Hospital and University of Michigan Health System. Lauren’s nursing background includes experience on med/surg and step-down units, in which she cared for people with multiple chronic diseases. Her passion for teaching and disease prevention began with the realization that many of these hospitalizations could have been prevented. It was then that Lauren decided to pursue a career as a Nurse Practitioner, graduating from the master’s program at Oakland University, with a focus on family medicine in primary care. Following graduation and working within internal medicine and urgent care settings for several years, she started to look for outside opportunities that align with wellness. Fate brought her to Dr. Lewerenz, and she began her training in functional medicine under his guidance.
Lauren loves to help empower patients towards achieving optimal wellness. Lauren feels that Functional Medicine is such a joy to practice because patients are engaged in their health, feel more balanced, look forward to their visits at Longevity Health Institute and learn what’s new and emerging in preventative medicine.
When not at work, you’ll find Lauren spending time with her husband Will and their three children: Olivia, Mackenzie, and Owen. They love spending the weekends exploring local activities, trying new restaurants, gathering with friends and family, or watching the kids’ sporting events. Lauren also enjoys riding her Peloton and competing in Orange Theory, stacking classes, and competing on the leaderboard. Lauren enjoys staying active and healthy while making the most of her time and enjoying this one precious life we are given.
Alexandra Bailey, FNP-BC
Alexandra is a board-certified nurse practitioner specializing in family practice. She completed her education through Oakland University, Beaumont, DMC and St. Joseph Mercy Hospital. Alexandra began her career working surgical intensive care at DMC. This experience highlighted the importance of personalized comprehensive preventative care. She realized that early intervention through nutrition, exercise, and nutrient supplementation are key for a healthy future and prevention of chronic disease. During her graduate school education, she was given the opportunity to work with Lauren Ross at Longevity Health and fell in love with functional medicine. After graduation Alexandra completed a fellowship with Dr. Lewerenz and joined the practice. Alexandra feels extremely grateful to have the opportunity to work with Dr. Lewerenz at Longevity Health because his practice philosophy for wellness and prevention is such an important service to our community. Alexandra is passionate about health and nutrition. She is a certified yoga instructor and a volunteer for Make-a-wish Michigan. She lives in Royal Oak with her husband (Brad), Beagle mix (Jay), cat (Pandapple), and a 22-year-old turtle named Icarus. She enjoys hiking, backpacking, rock climbing, dance and traveling to new places. If you need a recommendation for a good hike in the area or at any of our National Parks, be sure to ask. Alexandra looks forward to meeting you in the office for your next visit!
Naomi Martoia, RN
Naomi has been a registered nurse for 31 years and has focused most of her career skills in natural medicine, nutrition, and infusion therapies. She has spent the last 14 years working as an Infusion Director establishing IV therapy programs in several offices as well as developing wellness education programs for Functional Medicine. At Longevity Health Institute, Naomi is the Concierge Nurse Liaison and manages our innovative IV program. She offers several esthetic options within our office by bringing the benefits of PRP to patients who want thicker hair and more radiant skin. She also works closely with our supplement companies to bring you the best options to support your health journey.
Naomi is married and the mother of 2 adult children. Their whole family loves to explore the world through hiking adventures especially in the mountains. In her free time, she loves gardening. In the summer you can frequently find her planting and harvesting flowers and herbs. In the winter she loves growing edible sprouts, starting flowers from seed, and creating succulent gardens. Her love of repurposing vintage or salvaged containers leads to many thrifting adventures. She loves making her home a place to be creative, healthy and encourage personal growth.
Shannon Rottman, PA-C
Shannon is a well-established physician assistant with over 15 years of family medicine experience. Shannon earned her undergraduate training in pre-med at Spring Arbor University and received her master’s in physician assistant studies from Baylor College of Medicine in Houston, TX. She is conversant in Spanish and feels very blessed to work with such a wonderful staff at Longevity Health Institute.
Shannon has a passion for fitness and optimal health. Her journey in functional fitness and nutrition began in 2010 after receiving her Level 1 CrossFit Trainer certification, then dove into studying functional medicine when she developed an autoimmune condition herself. Later, she trained under multiple functional medicine providers and has over 5 years of functional medicine experience. Shannon lives in Romeo with her husband and 4 children. Shannon enjoys coaching, watching her kids play sports, home renovation projects, and CrossFit training.
Lauren Meier Zessin, AGPC-NP
She is a board certified Adult Geriatric Primary Care Nurse Practitioner (AGPC-NP) with a master’s in nursing from Vanderbilt University. As an AGPC-NP she specializes in caring for patients aged 13 through the lifespan. Before joining Longevity Health Institute Lauren worked in an acute care setting specializing in the care of older adults, and prior to that worked in functional medicine. She is passionate about helping patients achieve optimal health, prevent chronic disease, and uncover root causes of symptoms.
Lauren is also a yoga teacher and specializes in teaching therapeutic yoga classes along with mindfulness practices for stress reduction. In her spare time, she loves to take nature walks, spend time with her dog and husband, volunteer with the national adrenal disease foundation, and try new healthy recipes!
Lauren Toma, PA-C
She is a board certified Physician Assistant (PA-C). She went to University of Michigan -Ann Arbor for undergrad (Go Blue!) and Rush University Medical Center in Chicago for her PA education. She has a passion for health and fitness and she played volleyball throughout her high school and college career and continues to play recreationally.
Lauren enjoys working out, walking in nature with her husband and their dog, traveling, and spending time with family and friends!
