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Medical Staff – Internal Medicine


Terry Schaack, M.D.

Medical Director

Dr. Schaack is in his 25th year of private solo practice at the same location in Beverly Hills, CA. His practice of medicine has given him the opportunity to provide medical care to the some of the most discerning patients of Southern California including those in entertainment, real-estate, finance, foreign royalty, and heads of state including a president of the United States. During this time, his intellectual curiosity has driven him to act as Principle Investigator (PI) for privately sponsored clinical research with companies such as Sandoz Pharmaceutical, Laboratory Corporation of America and Google. He is currently PI on six clinical studies.

In 2003 Dr. Schaack accepted the opportunity to help develop and lead the California Heath & Longevity Institute, a one-of-a-kind proactive and preventive wellness facility, which consumed most of the remainder of his professional bandwidth. He lives with his wife, their son and daughter, and assorted pets in Beverly Hills.


Jonathan R. Cole, M.D.

Medical Director and Managing Partner

Dr. Jonathan Cole, a board-certified internist, comes to California Health & Longevity Institute, Inc. with extensive experience in the areas of preventive and internal medicine. As Medical Director, he practices precision medicine which provides a 360 degree tailored approach to patient health and wellness with an emphasis on prevention so that patients live better, longer. Before joining California Health & Longevity Institute, Inc., Cole was a clinical instructor at the prestigious University of Southern California, Keck School of Medicine, with responsibility for teaching medical students the art of history-taking and physical diagnosis. During his career, he also served as the Vice President of Medical Staff for Saint John’s Health Center, elected by his peers to the Executive Board, and asked by the Saint John’s Health Center Trustees to be on the Board Affairs Committee of the Foundation.  Dr. Cole has lectured to insurance companies, health and wellness symposiums, and Young Presidents' Organization groups on many topics including corporate health and wellness and cardiovascular disease prevention.
A graduate of the University of California, San Diego, Dr. Cole holds degrees in Biology and English Literature with a focus on the works of James Joyce. He attended the Chicago Medical School, where he graduated with highest honors in the Alpha Omega Alpha Honor Society. His medical training in internal medicine was completed at the Baylor College of Medicine in Houston, Texas as well as the Texas Medical Center, where he received the award for “Most Outstanding Resident in Primary Care.”  He currently resides in Encino, California with his wife and two daughters and enjoys playing golf and tennis, hiking, and yoga. 

Alexis Peraino 8610

Alexis Peraino, M.D.

Internal Medicine

Dr. Alexis Peraino has an extensive background in internal medicine, obesity medicine, exercise physiology and nutrition and is passionate about the importance of prevention for health and longevity. Dr. Peraino was previously a faculty member in the Department of General Internal Medicine and The Center for Weight Loss at Cedars-Sinai Medical Center and continues as an Assistant Clinical Professor Step II in the clinical voluntary series with the David Geffen School of Medicine, UCLA and Cedars-Sinai Medical Center. Board certified by the American Board of Internal Medicine, Dr. Peraino is a frequent lecturer focusing on exercise, nutrition, weight management and preventive care. In 2015, Dr. Peraino authored a chapter in The Clinician’s Guide to the Treatment of Obesity: Physical Activity and Writing an Exercise Prescription. Dr. Peraino has developed a comprehensive approach to patient care, combining preventive care and evidence based medicine to ensure a balanced lifestyle approach to overall health, fitness and wellbeing. 

Dr. Peraino received her Bachelor of Science degree in Exercise Physiology from the University of California, Davis and received her medical degree from the Chicago Medical School, where she graduated with highest honors as a member of the Alpha Omega Honor Medical Society. She completed her internal medicine residency at Cedars-Sinai in Los Angeles, where she served as Chief Resident, and was awarded the Ben Newman MD Humanitarian Award from the Department of Internal Medicine's residency training program in 2005 and 2006. She is currently a member of the American College of Physicians and The Obesity Society. 

Leon Henderson 8830

Leon Henderson-MacLennan, M.D.


Dr. Leon Henderson-MacLennan joined California Health & Longevity Institute, Inc. in 2013, having spent 20 years developing expertise in internal medicine, medical genetics, and applied health services research. Dr. Henderson-MacLennan was a faculty member at Cedars-Sinai Medical Center in the Department of General Internal Medicine prior to arriving at CHLI. He has published abstracts and manuscripts for numerous peer-reviewed publications including those dedicated to critical appraisal of the medical literature in order to advance both preventive and therapeutic approaches to patient care. He has authored a chapter on genetic counseling for gastrointestinal patients; and has received several teaching awards for his work with medical students, residents, and fellows in both internal medicine and genetics.

Board certified by the American Board of Internal Medicine, Dr. Henderson-MacLennan is a member of the American College of Physicians, the American Society of Human Genetics and several other professional societies. Dr. Henderson-MacLennan earned a Doctor of Medicine from Cornell University and a Bachelor of Arts in Linguistics from Northwestern University. He completed an internship and a residency in internal medicine at Cedars-Sinai. He also completed a fellowship in medical genetics at the University of California, Los Angeles (UCLA) after which he was appointed Assistant Clinical Professor of Medicine at the same institution.