Dr. Yoon graduated from Loma Linda University where he completed medical school and his post graduate training. Dr. Yoon is Board Certified in both Physical & Rehabilitation Medicine and Pain Medicine.
His goal is to promote the public’s awareness of physical medicine and rehabilitation for those suffering from pain.
In his spare time, Dr. Yoon enjoys music and watching team sports.
Jason Packer DC, PA-C graduated from Palmer College of Chiropractic West in San Jose California in 2002.
He practiced as a Chiropractor in the Sacramento area for nine years. Wanting to further his education, he graduated from UC Davis FNP/PA school in 2013. Dr. Packer briefly worked in Orthopedic Surgery before specializing in pain management at CIS.
Dr. Packer enjoys spending time with his wife and four children. In the summertime he likes to water ski, and snow ski in the winter.
Karen Smith, PA-C, is a board-certified Physician Assistant who earned her Master of Science in Physician Assistant Studies from University of Mary Hardin-Baylor. During her training, she completed comprehensive clinical rotations in behavioral and mental health, emergency medicine, internal medicine, general surgery, neurology, orthopedics, family medicine, and intensive care through programs with Baylor Scott & White Health and the U.S. Department of Veterans Affairs in the state of Texas.
In addition to her clinical work, she serves as an Associate Program Director for a supported living services agency, where she helps oversee programs that support adults with developmental disabilities and works to ensure high-quality, compassionate care for this community. Before entering the medical field, she proudly served in the United States Navy, an experience that shaped her dedication to service, teamwork, and leadership. Outside of work, she enjoys spending time with family, going to the gym, and working on DIY home improvement projects.
Ryan Wagner is a physician assistant who brings both warmth and expertise to every patient relationship. A proud graduate of Loma Linda University — where he earned his degree with honors — he also brings a rich background in family medicine that shaped his whole-person approach to care.
He is passionate about seeing patients on an ongoing basis, building lasting relationships, and guiding them toward better health through lifestyle-based interventions and rehabilitation. His goal is not just to treat, but to partner with patients on their long-term wellness journey. Outside the clinic, he enjoys time with his wife, young child, and their dog.
As the Program Director for CIS Keystone Functional Restoration Program, Dr. Gilliland has over 48 years of experience in health care and human services as both a direct care provider and an administrator of contracts, grants, programs and services in Ohio, Colorado, Nevada, New Mexico, Hawaii, and California.
For nearly 20 years, Dr. Gilliland has incorporated the new discoveries in neuroscience into his work educating patients, their families and staff on how the brain is significantly involved in the development of the presenting problems as well as the solutions.
While not at school and work, Dr. Gilliland has enjoyed traveling in Asia, Europe. Latin American, and most of the United States playing golf, earning a scholarship to play football at the University of Oregon, telemark skiing the slopes of Western Colorado, and forming and playing guitar in a rock ‘n roll band (The Stupid Band) in 1985.
Dr. Schaffer is a Physical Therapist who graduated from Sacramento State getting his undergraduate degree in Sociology and Kinesiology before attending the University of St Augustine for his doctorate. He has a well-rounded background practicing since 2020 in diverse setting with experience that spans across inpatient rehab, skilled nursing, neurological rehab, and outpatient orthopedics, with a treatment approach emphasizing movement and exercise based functional interventions along with manual therapy.
Recently, Brandon has focused on chronic pain and pain neuroscience education. He is passionate about using a multidisciplinary approach to address chronic pain to empower patients to regain control of their lives and return to the activities they love. He is also a functional capacity evaluator, helping to ensure that patients' true capacity is noted for a safe return to work.
In his free time Dr. Schaffer enjoys being outdoors, golfing, hiking, music and traveling as much as possible.
Robert Fender is a highly experienced fitness professional with over 20 years of expertise as a NASM and AFAA Certified Personal Trainer. Specializing in functional conditioning, corrective exercise, and group fitness, he is passionate about helping clients achieve their wellness goals. Robert's education includes an Introduction to Physical Therapy program at Sacramento City College, enhancing his knowledge of movement and injury prevention. An avid outdoorsman, he enjoys golf, mountain biking, and fly fishing, reflecting his dedication to an active and healthy lifestyle
Liane Quirk is an energetic and experienced health educator. Committed to helping individuals regain control of their lives, she empowers patients with the tools, knowledge, and strategies needed to navigate the complexities of chronic pain effectively.
She holds a BA from UC Davis and Master’s in Public Health (MPH) from San Jose State University. She has also pursued additional coursework in mindfulness-based stress reduction (MBSR) and weight management. Liane has extensive expertise in creating personalized, evidence-based education programs tailored to diverse populations, focusing on holistic wellness and blending education with practical strategies.
Liane began her work in functional restoration in 2017, providing individual and group support in nutrition, stress management, sleep optimization, mindfulness practices, creative art, and professional development. Outside of work, Liane is artistically inclined, an avid reader, outdoor recreationalist, and world traveler.
Dr. Brynn Honrada, PT, DPT, is a licensed physical therapist who has been working within a multidisciplinary chronic pain clinic for several years and recently started working in the home health setting too. She has experience treating chronic pain, orthopedic, and post-acute diagnoses.
Dr. Honrada is passionate about helping her patients improve their functional mobility, independence with activities of daily living, and overall quality of life. In her spare time, she enjoys being with her daughter and family, watching all types of sporting events, and traveling anywhere with a beach.
Dr. Jeannine McAdams, PsyD, is a licensed clinical psychologist with a depth-oriented, psychodynamic approach to care, currently working within a multidisciplinary pain clinic setting.
She has experience in trauma-informed treatment and specializes in supporting individuals living with chronic pain, injury, and stress-related conditions. Her clinical work integrates insight-oriented therapy with evidence-based modalities, including CBT and mindfulness-based strategies, to address the complex relationship between psychological and physical health.
Dr. McAdams is passionate about helping patients cultivate self-understanding, restore functioning, and improve overall quality of life.
Dr. Ilhyung Kim is a licensed acupuncturist who completed both his formal professional education and doctoral training in acupuncture and East Asian medicine. With over 15 years of experience in the field, he received a Best Paper Award during his doctoral studies and a top award in 2025 while completing a year-long advanced program in Acupuncture & Eastern Medicine.
He also serves as an executive member of the Association of Korean Asian Medicine & Acupuncture of California and is committed to delivering high-quality, patient-centered care while continually refining his clinical skills.
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