Meet the Health Nucleus Team

At the Health Nucleus, we are leading the way in precision medicine. That means we generate a health assessment specifically for you.

Meet the Genetic Counseling Team

During your visit, you will encounter a team of experts who are there to answer your questions and guide your experience. Leading this group is your Health Nucleus physician, Dr. Pamila Brar, Chief Imaging Officer, Dr. David Karow and your personal concierge, Rikka Johnson who are dedicated to facilitating an insightful and comfortable visit.

Medical Director

Dr. Pamila Brar has practiced Internal Medicine in La Jolla, California since 1999, opening her own private concierge practice in 2009. Her private medicine practice utilizes technology to deliver highly individualized real-time medical care to patients at home, in the office, and across the care continuum. Her “open door” style is appreciated by all, from her adolescent patients up to her centenarians. Pam is a tireless advocate for her patients and loves to motivate and empower all under her care.

Dr. Brar is a graduate of the Scripps Clinic Internal Medicine Residency Program and was named the Ellen Browning Scripps Chief Medical Resident in 1998 before joining the general division of Internal Medicine. Pam holds an MD degree from Louisiana State University at New Orleans. She is certified both by the American Board of Internal Medicine, and the American Board of Integrative Holistic Medicine.As a patient engagement advocate, she routinely appears in local and national media on wide range of current health care topics. Her approach is to deliver up-to-date, evidence-based information via technology designed to be immediately accessible to her patients and her audience.She currently is serving as President-Elect for the American Academy of Private Physicians. Founded in 2003, the AAPP is a national non-profit organization that provides advocacy for the direct patient-doctor relationship and explores solutions to our changing health care system.

Chief Medical Imaging Officer

David S. Karow, M.D., Ph.D., is the Chief Medical Imaging Officer at HLI and the Chief Radiologist of the Health Nucleus. David’s expertise is designing and overseeing image acquisition generated by the advanced digital imaging machines in the Health Nucleus, which are key tools to delivering immediately actionable medical insight to our clients.

From there, our bioinformatics team takes his expert analysis of individual images and correlates that data with the genome—thus building our understanding of how the genome is constructed and how it codes for health risks. It is this combination of genomics and imaging that is the core of our Health Nucleus research and that builds HLI’s leadership in whole genome analysis.

David comes to HLI as an innovative leader in the medical imaging space who brings more than 10 years of experience in advanced MR Imaging, focused on the development and translation into clinical care pharma partners of diffusion- based MRI techniques. David was part of the team, led by HLI Scientific Advisor Anders Dale, that developed and implemented advanced diffusion weighted imaging techniques which permit detection and characterization of cancer in the prostate and other solid organs. This technology is also an integral part of Health Nucleus applications especially for whole body cancer detection.

Prior to joining HLI, David served as an Associate Professor in the School of Medicine at UCSD in the Department of Radiology where he still keeps an adjunct appointment. He’s most excited about HLI’s unique capability to combine quantitative imaging biomarkers with clinical and genetic biomarkers to create both lifetime and short-term risk profiles for all major diseases.


Michael Doney, MD, MPH, MS is a research physician in the Health Nucleus at Human Longevity, Inc. Dr. Doney completed his clinical training in emergency medicine at UC San Diego Medical Center and is board-certified in emergency medicine.

He completed graduate study in molecular genetics at the University of Cincinnati where his research focused on mapping of a chromosomal translocation breakpoint commonly found in uterine leiomyomas. As well, he completed graduate study in public health at the George Washington University and worked in public health programs at the US Centers for Disease Control and Prevention.

Concierge Program Manager

As the Concierge Program Director of the HLI Health Nucleus, Rikka Johnson brings with her over a decade of experience in the luxury hospitality industry. In her current role, Rikka oversees the guest experience at the flagship La Jolla facility, where she is constantly looking for ways to deliver the ultimate comfort and ease in a clinical setting, on par with the pioneering genomics and leading edge health intelligence HLI generates.

Prior to joining HLI, Rikka was the General Manager at Wolfgang Puck’s CUT at the Beverly Wilshire (A Four Seasons Hotel) in Beverly Hills. Ensuring the highest industry standards and leading a veteran service and culinary staff were just two of her many responsibilities while running the Michelin Star restaurant. Before that, she managed operations for the Four Seasons and Wolfgang Puck in San Francisco, Maui, and Washington D.C.

Rikka attended the University of Iowa to become a writer, but soon learned she was more interested in understanding others’ stories – a critical element to the concierge experience – so left with a degree in History and Anthropology.

Our team of physicians, nurses and technical leads for our modalities will walk you through each assessment and explain what they’re seeing in real time to maximize your comfort and understanding as you proceed through each step of your visit.





Robyn R. Heister is a physician on staff at Health Nucleus where she enjoys utilizing genetics and precision medicine to optimize patient health. She is Board-Certified in Emergency Medicine and began practicing in California in 2001. After more than fifteen years in the Emergency Medicine, Dr. Heister joined the Health Nucleus team with the intent of bringing a clear clinical voice and up-to-date best-practice guidelines to the organization.

Her experience in the emergency room led her to develop a keen interest in early interventions that can reduce the risk of developing debilitating chronic conditions which are an enormous burden on patients, families, and the healthcare system alike.

Dr. Heister is a believer in the power of effective communication, and as a practicing emergency medicine physician she helped develop and practice new strategies for patient interactions that drove better patient compliance and better health outcomes. She looks forward to continuing this work at Health Nucleus.

Dr. Heister is a graduate of UC Davis School of Medicine after which she completed a 4-year Residency Training program at UC San Diego. She earned a B. A. in Human Biology at Stanford University in 1993.


Keegan Duchicela, M.D., is a physician in the Health Nucleus at Human Longevity, Inc. Dr. Duchicela received his medical degree from the University of California, San Francisco, School of Medicine. He completed his clinical training in family medicine at the Stanford-O’Connor Family Medicine Residency Program, where he continued as clinical faculty.

Prior to joining Human Longevity, Dr. Duchicela worked at the digital health platform, HealthTap, and was a medical director at Google’s onsite primary care Wellness Centers. Dr. Duchicela is passionate about preventative medicine and using technology to inform, empower and guide patients in their journey to better health.


Thomas N. Folan M.D, is a Board-Certified Radiologist in the Health Nucleus at HLI. After pursuing a course of study in Philosophy at the University of Illinois at Chicago, and earning his medical degree, magna cum laude, from Ross University School of Medicine.

Dr. Folan completed a medical internship at the Staten Island University Hospital in New York City. During his residency in Diagnostic Radiology at the John H. Stroger Jnr. Hospital of Cook County in Chicago, Dr. Folan was a recipient of the Society of Interventional Radiology Resident in Training scholarship. He completed his fellowship in Diagnostic Neuroradiology at the University of Rochester, New York. Subsequently Dr. Folan spent time honing his craft both in private practice and in the teleradiology space prior to joining the Medical Imaging team at HLI. Dr. Folan’s professional interests include Precision medicine, Functional & Integrative medicine and the application of advanced neuroimaging techniques for neurodegenerative disease.


Jaime J. Barea is a clinical geneticist in the Health Nucleus at Human Longevity, Inc. Dr. Barea completed his clinical training in pediatrics, clinical genetics and biochemical genetics at UC San Diego Medical Center / Rady Children’s Hospital.

He earned his B.S. in Biology at the University of Wisconsin-Madison and received his medical degree from Tufts University School of Medicine.

Dr. Barea is board-certified in pediatrics, clinical genetics and genomics, and clinical biochemical genetics. He is also a fellow of the American College of Medical Genetics and Genomics (FACMG).

Nurse Practitioner

Kristi earned her Master’s degree from California State University. She is an AANP certified Family Nurse Practitioner. She is board certified as a Public Health Nurse, Holistic Nurse and Hyperbaric Medicine Nurse.

In addition to her background in critical care, emergency medicine and multiple leadership roles, Kristi has extensive experience in Integrative and Functional medicine, nutraceuticals and natural healing therapies. She has helped numerous patients, families and communities achieve their health and lifestyle goals.

Danielle Dorris, BSN, MS, FNP-C
Nurse Practitioner

Danielle Dorris is a Family Nurse Practitioner in Health Nucleus at Human Longevity, Inc.  She was awarded a University Merit Scholarship to Cal State Long Beach were she earned her Bachelor’s Degree in Nursing.  In 2015 she graduated from Georgetown University in Washington, D.C., with her Master of Science and Family Nurse Practitioner Degree.  Danielle is passionate about the future of medicine and is currently enrolled in Stanford University’s Genetics and Genomics Certificate Program. 

Danielle enjoys empowering her clients through evidenced-based research and encouraging lifestyle changes to achieve health goals.  She believes in Dr. Craig Venter’s vision for the future of genomics in medicine and is honored to be striving for new medical practice guidelines.