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Meet the Doctors

  • Dr.
    Jeffery Layne

    Dr. Layne brings 30 years of experience to one of the most established practices in the Tri-Valley community. Dr. Layne is a master adjuster specifying in stretching, bony adjusting, and exercise. A graduate of Los Angelos School of Chiropractic, Dr. Layne not only delivers excellent care but brings wisdom and humor into the lives that he touches.

     Dr. Layne is a 20 year resident of the San Francisco Bay Area and enjoys getting into the outdoors as much as possible. He likes hiking, running, backpacking, and protein shakes and loves the environment and the people of the San Francisco area community.

  • Dr.
    Jim Yang

    Having been very active in all aspects of his life, Dr. Jim Yang understands everyone's desire to live an optimal and higher quality of life. Having been involved in various sports while growing up, Dr. Yang realized the importance of multi-disciplinary care early on and following a sports-related injury discovered Chiropractic.

    Dr. Yang received a Bachelor of Science in human biology and then graduated from New York Chiropractic College in 2004 receiving his Doctor of Chiropractic degree. Dr. Yang was very active in the Sports Club attending many athletic events providing chiropractic care to all participants (acute and chronic conditions).

    Dr. Yang interned at the United States Naval Hospital, Camp LeJeune providing quality health care to active duty military men and women. Dr. Yang had attending privileges in various departments (orthopedics, neurology, podiatry, sports medicine, sick call, internal medicine, etc.)

    Dr. Yang constantly strives to improve and update his medical knowledge through countless post-graduate study courses as well as research. He realizes the importance of exercise and nutrition, practicing these beliefs regularly, as a major part of his daily regimen.

  • Dr.
    Tyrone Isquirdo

    Dr. Tyrone Isquirdo is a California native.  He grew up in Union City, where he graduated from James Logan High School.  After completing his undergraduate studies, he attended Life Chiropractic College West and graduated with honors in 1985.

    In 1989, Dr. Isquirdo brought his practice to Union City, where he had continued to serve the Tri-City communities for the past twenty years.  Dr. Isquirdo moved to Pleasanton, California in 1996, where he raised his three children Tyler, Briana, and Dylan.

    After many years and numerous requests from friends and family, Dr. Isquirdo also began practicing in the Tri-Valley area in 2007.  In 2010 he joined the office of Dr. Jon Widenbaum, who had been serving the Dublin and the surrounding areas for the past two decades.  He now practices solely in the Dublin to serve the people of the communitiy that have meant so much to him over the years.

    Having grown up in Union City and raising his own family in Pleasanton, Dr. Isquirdo has always been actively involved in both the Tri-Valley area.  He enjoys spending time with his family and coaching youth sports.

    Dr. Isquirdo has had advanced training in the areas of treatment and rehabilitation of accidental industrial and sports related injuries.  He also specializes in the treatment of whiplash, spinal trauma and family wellness.

  • Dr.
    David Hofstetter

    Dr. David Hofstetter was injured in a car accident and was getting worse in spite of pain medication, muscle relaxers, physical therapy and massage. A friend suggested chiropractic. Wow! What a difference! He felt better immediately! Over the next few months his body felt completely healed! So the patient became a doctor of chiropractic and has been helping people heal ever since!

    Dr. David has practiced in San Ramon since 1992 and joined Widenbaum Chiropractic Group in 2012.

    Dr. David is warm and caring. Patients get an immediate sense that he is truly interested in their health and takes extra time to explain why they are having their symptoms and what would be the best way to restore their health. 

  • Dr.
    Melinda Roman

    Dr. Melinda Roman has been serving families in Contra Costa County for more than five years, and is excited to bring her passion for Chiropractic to the families of the Tri-Valley area. Prior to attending Chiropractic school, Dr. Roman received her Bachelor's degree in Exercise Physiology from California State University Chico.

    Her commitment to the Chiropractic profession and her patients wellbeing has allowed her to realize success in helping her patients reach their wellness goals. One of Dr. Roman's areas of expertise is serving all branches of the family tree from day old newborns to grandparents who are in their golden years.

    Dr. Roman is certified in the Webster technique and has confidence and experience in working with pregnant moms to-be and pediatric patients for torticollis, colic, ear infections, digestive issues, ADD-ADHD, Autism and preventative wellness care.  Her passion for treating pediatrics is directly related to her own 'Chiropractic Story.'

    For more information about Dr. Roman, and to read about her personal 'Chiropractic Story', please visit her website at

    'As the twig is bent, so grows the tree.'

Dr. Jonathan J. Widenbaum, PhD, CHNP, CNC, BCIM, FAANC

For 27 years Dr. Widenbaum has been serving the Tri-Valley community as a natural healthcare professional, focused on finding solutions for patients diagnosed with chronic health conditions that were not responding to traditional medical treatment. He uses a "whole-person approach" that looks to get to the underlying cause of these conditions. These include symptoms of low thyroid, diabetes, fibromyalgia, peripheral neuropathy, gastorintestional issues, brain chemistry imbalances of depression, anxiety, & ADHD to name a few, as well as slow metabolism resulting in the inability to lose weight.

Dr. Widenbaum found the immune system to be the common denominator among these chronic health conditions which is why the medical approach alone is often inadequate. Patients continued symptoms often get ignored, the lab reports get 'treated' and the person is left confused and frustrated.

As a Holistic Practitioner and Functional Medicine Nutritionist, Dr. Widenbaum is trained in functional endocrinology, functional immunology, functional blood chemistry interpretation, brain chemistry analysis as well as applied kinesiology. Like a health detective, he then uses a scientific approach that uncovers the hidden mechanisms and immune system triggers of chronic health conditions that lead to symptoms. He then works systematically to remove these triggers allowing your body to rejuvenate.

Dr. Widenbaum, PhD, is Board Certified in Integrative Medicine, has a Doctorate degree in Clinical Nutrition, and is a Certified Holistic Nutrition Practitioner. He was also distinguished as a Certified Nutritional Specialist from the prestigious American Association Nutritional Consultants of which he has been honored as a diplomat member. 

Dr. Widenbaum attended Wayne State University in Detroit, Michigan prior to graduating from Chiropractic College, Los Angeles, CA in 1988. While Dr. Widenbaum no longer practices chiropractic, his current passion is to offer natural solutions to chronic health conditions and immune system disorders using natural interventions and drug-free health rebuilding techniques. He has helped over 20,000 residents of the Tri-Valley community with health conditions improve their quality of life without the use of drugs or surgery. 

His mission is to add value to your life!

Dr. Widenbaum and his wife Diane, have 3 children, Jared, Megan and Jaela.  

Curriculum Vitae of Dr. Widenbaum

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Office Hours

Our Regular Schedule


9:00 am-1:00 pm

3:00 pm-7:00 pm


9:00 am-1:00 pm

3:00 pm-7:00 pm


9:00 am-1:00 pm

3:00 pm-7:00 pm




9:00 am-1:00 pm

3:00 pm-7:00 pm


9:00 am-1:00 pm




Reviews By Our Satisfied Patients

  • "I have been seeing Dr. Jon for 11 years. When I began seeing him, my spine curved in the opposite direction of how it should. It is now curving in the right direction. Dr. Jon is extremely knowledgeable about chiropractic. He is holistic in his approach to better health. I highly recommend Dr. Jon."
    Terri Bach, San Ramon, CA
  • "I came to Dr. Widenbaum because of back pain due to an auto accident. My back pain started going away, and I was able to sleep at night. I definitely recommend the Widenbaum Chiropractic team.
    They gave and provide the best healthcare."
    Mashied Shariati