About Us

Brian Flannery, DC, LCP, DPhCS, MBA, is a doctor of chiropractic who brings more than 20 years of experience in integrative pain management to Atlas Health Center, serving people of all ages in San Francisco, California, and throughout San Francisco County.

Dr. Flannery began his professional pursuits at the University of Wisconsin at Eau Claire, earning his Bachelor of Science in biology. He subsequently enrolled at the Palmer College of Chiropractic in Davenport, Iowa, and earned his Doctorate of Chiropractic.

Since entering private practice, Dr. Flannery has held various positions, including managingpartner, co-owner, and associate chiropractor. Dr. Flannery loves getting to know the people in his care and provides a comprehensive treatment that eases pain and improves mobility.

Outside of the office, Dr. Flannery enjoys sharing his knowledge and expertise by writing in industry publications and speaking at conferences and events. Dr. Flannery is also a testing committee member on the National Chiropractic Board of Examiners.

Henry Oyharcabal, DC, is a doctor of chiropractic at Atlas Health Center, serving people of all ages in San Francisco, California, and throughout San Francisco County. Dr. Oyharcabal values the benefits of chiropractic care and other natural paths to wellness.

A native San Franciscan, he graduated from the University of San Francisco and earned his Doctorate in Chiropractic at Life West University in Hayward, California.

Dr. Oyharcabal spent two years mentoring in Arizona at one of the largest practices in the country. He founded Atlas Health Center in 1992 to help people achieve optimal health and wellness. Atlas Health Center is certified by the Spine Research Institute of San Diego for the case management of whiplash.

Dr. Oyharcabal also serves as the chiropractor for the San Francisco Bay Area Pro-Am Basketball League, which showcases the talents of local professional and college players. Dr. Oyharcabal proudly holds membership in several professional organizations, including the California Chiropractic Association, the San Francisco Chiropractic Association, and the Life Chiropractic College West Alumni Associations. He welcomes anyone seeking relief from acute or chronic pain to Atlas Health Center today.

Hoang Pham, DC, is a dedicated Doctor of Chiropractic, born and raised in the Bay Area, with a deep passion for helping individuals of all ages become the best version of themselves.
Dr. Pham earned his Bachelor of Science in Biology from the University of California, Riverside, before continuing his education at Life Chiropractic College West, where he received his Doctor of Chiropractic degree.

With a strong belief in the body’s ability to heal and thrive through movement, personalized care, and intentional wellness, Dr. Pham is excited to bring his knowledge and energy into every patient interaction—empowering others to live healthier, more active lives.


He shares, “I’m passionate about helping people become the best versions of themselves—physically, mentally, and emotionally. I believe in the power of movement and hands-on care to improve lives, and I’m dedicated to supporting long-term wellness and performance through personalized treatment. Outside of the clinic, I stay active by going to the gym regularly and playing basketball whenever I get the chance. Fitness, mobility, and recovery are not just part of my work—they’re a core part of how I live. Whether I’m supporting others or working on my own goals, I’m driven by a simple mission: to help people move better, feel better, and thrive.”

Calvin Gong, DC, is a doctor of chiropractic who has and still is adjusting many patients from all over the Bay Area, and even the East Coast. He joined Atlas Health Center after being in a family partnership for most of his 30+ years chiropractic career. He loves the power of chiropractic and what it has done and continues to do for those who seek his care. His mantra has always been to Do What I Love and Love What I Do.

A native San Franciscan born in the heart of Chinatown, he attended schools here in San Francisco and eventually graduated from UC Berkeley. He earned his chiropractic degree from Palmer College of Chiropractic - West.

Dr. Gong is a state-appointed Qualified Medical Evaluator for the State of California to resolve medical-legal issues in the workers' compensation arena. He has also been a BACKSFE-certified injury prevention specialist and project leader for large corporations like United Airlines, Kendall-Jackson Estates, and San Jose VTA.

With his passion and love for golf, Dr. Gong is a certified Titleist Performance Institute level 2 medical professional. He was giving time to Saint Ignatius College Preparatory's sports medicine department as the in-house chiropractor.

Dr. Gong presently is involved with the SI's varsity girls' and boys' golf teams. He is also the onsite certified TPI professional at Green Hills Golf Club in Millbrae, working with the Academy members. He volunteers with the First Tee of San Francisco at Harding Park as their fitness/medical director.

Dr. Tyler Jochen is a chiropractor with a strong background in exercise science and extensive experience treating auto accident injuries. After spending significant time training in the high-volume San Francisco Atlas Health Center, he is fully versed in the clinic’s established personal injury systems, documentation standards, and treatment protocols. His approach emphasizes neurologically based chiropractic care, functional movement assessment, and long term recovery strategies that address both the physical and emotional impact of trauma.


Originally raised in San Jose, California, Dr. Jochen earned his Bachelor’s degree in Exercise Science from the University of Minnesota, Crookston, where he also played collegiate baseball. He later completed his Doctor of Chiropractic degree at Life Chiropractic College West, one of the leading chiropractic institutions in the country. Prior to college, he attended Archbishop Mitty High School in San Jose.Dr. Tyler is passionate about helping patients restore movement, reduce pain, and return to the activities they love. His treatment philosophy focuses on identifying the root cause of dysfunction, improving biomechanics, and supporting the body’s natural healing processes. Outside the clinic, he enjoys staying active and spending time outdoors. His hobbies include golf, snowboarding, exploring nature, and trying new experiences whenever possible. While he was raised in San Jose and maintains strong ties to the Bay Area, Los Angeles has also become a second home thanks to his extended family there.

Dr. Yoo earned his B. Pharm degree from pharmacy college in Chung Ang University in Seoul, South Korea, which is one of top pharmacy colleges in South Korea and earned his masters degree and doctoral degree in Acupuncture and Oriental Medicine from American College of Traditional Chinese Medicine and California Institute of Integral Studies in San Francisco.

During his time at Pharmacy college in Chung Ang University, he met fellow students with the same interests at university and he became a founding member of the Korean traditional medicine club in his university. Dr. Yoo became more passionate about Korean traditional medicine and Oriental medicine. Dr. Yoo completed additional training in sport medicine, herbal medicine, and all other oriental medicine as he has had the opportunity to learn from many gifted oriental masters and professors and learned precious wisdom about how to view each individual and transition from imbalance to balance (from pathosis to eucrasia).

Oriental medicine is to study how to make people adapt to a certain natural and social environment through nourishing and treating their body and mind. To reach the goal, Dr. Yoo offers many modalities such as Acupuncture, herbal medicine, supplements, Moxa, Sports medicine, and other oriental medicine. Dr. Yoo has practiced and experienced in both eastern and western medicine for more than 15 years and served to help people in the bay area for many years.

Dr. Yoo is actively participating in Acupuncture associations to promote his profession and experience. He is a current member of the Association of Korean Asian Medicine & Acupuncture of California (AKAMAC), a member of the society of sports Korean medicine, and a member of American integrative medicine institute. In his spare time he enjoys cooking, reading, and training Taekwondo and Kendo to improve body strength and mind as he held a black belt in Taekwondo.

I am an avid reader of Mystery and Fiction Novels, most of which you can find me reading in paperback form (remember those?!). As a Native San Franciscan, I enjoy sightseeing all the beautiful spots in the city with my daughter.

Over the years, I have had the privilege of observing and experiencing the power of chiropractic.

I am new to SF and I am already loving it, working with this amazing staff with so much experience and passion, and seeing the smiles and relief from the patients faces every day just makes it better!!

Passionate about enhancing patient care and dedicated to customer service. I savor every moment spent lost in books, whipping up delicious dishes and exploring the vibrant city. On weekends, you’ll find me lifting weights or jetting off to new adventures.