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Board of Directors

SW Portland, OR

Michael Arnot, DC

President / Insurance Relations Chair

Dr. Michael J. Arnot, D.C. has been in practice for 32 years. He has owned and operated clinics in California and Indiana, as well as the present clinic in Portland, Oregon, which was established in February of 2003.

A pre-med graduate of the University of San Francisco and the Palmer College of Chiropractic, he is licensed to practice in Oregon, California, Ohio, and Indiana. Dr. Arnot is a member of the Palmer College of Chiropractic International Alumni Association and the Hillsdale Business and Professional Association. He is also a member of the ICA (International Chiropractic Association), ACA (American Chiropractic Association) and OCA (Oregon Chiropractic Association).

Tigard, OR

Amanda Tipton Stiller, DC

Vice President / Convention Chair

Hello fellow OCA members!  I am a 2014 graduate of University of Western States practicing in Tigard at Crossroads Chiropractic.  I have been serving on the board as an appointed member since August of 2021, and I am grateful for the continued opportunity to represent the membership.  I believe that there is a lot to be done to continue the advancement of chiropractic within the health care industry.

Growing up I was pursuing a career as a professional ballet dancer, however due to an injury I had to transition to taking classes recreationally.  I now work with the Oregon Ballet Theater as a part of their health and wellness team.  When not at the office I’m either in dance class, hiking a trail with my dog and fiancé, or on one of the many disc golf courses in the area.


NW Portland, OR

Michael Lell, DC


I’m a 2014 graduate of UWS and working at ZoomCare. I also sit on the OBCE’s peer review committee and have been active with the OCA since 2012 increasing their student membership by 200%. Since graduating, I’ve been a director once and have sat on the membership and social media committees. We’ve got a lot of work to do as a board. From healing old and recent divides and bringing back a sense of comradery to progressive our legislative agenda and modernizing some of our practices. I’m looking forward to rolling up my sleeves and getting to work. If I’m not in the clinic, you can find me at my Masonic lodge, in the gym, or hanging out with my new son. 


Coos Bay, OR

Robert Richards, DC


I am a 1988 graduate of Western States and have practiced in Coos Bay/North Bend, Oregon since 1990.  I previously served on the OCA Board of Directors from 2011-2012 and held the position of Treasurer.  I am a past member of ODOC, current member of ACA, and past member of a Legal Professional Responsibility Committee.

Professionally, I will work within the OCA to promote continued expansion of chiropractic into hospitals, integrated health care facilities, private insurance PIP, VA, OHP and worker’s compensation.  Philosophically, I work within the OCA to support patient rights to make healthcare decisions based on best practices, informed consent, philosophical, ethical, moral, and religious values.  I believe the OCA is a critical organization to increase public and political awareness of natural health care and how chiropractic can contribute to public health especially in times of crisis.  I look forward to once again serving the OCA membership and the Chiropractic profession as a whole.

SE Portland, OR

Todd Turnbull, DC


Chiropractic is about serving others.  As a bold leader and an outspoken advocate for health, freedom and Chiropractic, it is a natural fit for me to want to serve on the Oregon Chiropractic Association Board of Directors.  I stand for Chiropractic and Chiropractors being the primary resource for “Health” care.

I have been an educational speaker at many events over the years for the OCA.  I want to continue to be a proactive part of the leadership and a face of our profession in Oregon healthcare.  I am also a member of the OCA’s Chiropractic Practice & Innovation Council (CPIC).

I am willing to take my passion and my voice to represent the field doctors with integrity and authenticity.  I look forward to collaborating with my colleagues to propel Chiropractic into the future, to oppose those entities that want to supress our voices and to create opportunities for furthering the mission of Chiropractic and the Oregon Chiropractic Association.

Tigard, OR

Dan Beebe, DC

Director / Legislative Chair

A hearty smile to all those members that are standing for the profession here in Oregon. I am deeply appreciative of the concerted efforts of this organization in standing for Chiropractic.

Previously I have served the organization for several years including President and past President.  Additionally I have served on numerous other boards as well.  These are trying times for all of us and I believe I will bring needed experience to the board.  For those of you who can remember I was on the board through the the Work comp fiasco of 1990.  There will, in all likelihood, continue to be challenges similar to the current vaccine mandate loosed upon our patient’s and ourselves.  Finding a way to be compliant with any mandates while protecting patient’s and individual rights will require thoughtful approaches and intelligent decision making.  Some of those decisions may be needed in short time periods.  I believe the experience I have will be most helpful.  This profession is truly great, let us all continue to work towards making it even greater.

NE Portland, OR

Mark Gabriel, DC


Dr. Mark Gabriel, DC, a Cairo-born chiropractor and founder, brings over 15 years of expertise to the healthcare industry. His early experiences in his mother’s pharmacy in Egypt ignited a passion for holistic health, leading him to obtain a Doctorate in Chiropractic from Palmer College, Florida. Dr. Gabriel excels in merging cutting-edge medical technology with traditional care, focusing on root-cause treatments.
His leadership skills are further highlighted by his recent appointment to the Oregon Chiropractic Association (OCA) Board of Directors. Additionally, Dr. Gabriel is an active contributor to the Rotary Club and Toastmaster Club of Portland and co-chairs the Wheel of Power Committee. He also serves on the Peer Review Committee of the Oregon Board of Chiropractic Examiners.
Residing in NE Portland, Dr. Gabriel balances his professional life with active hobbies, including snowboarding, motorcycling, and participating in Spartan races.


SW Portland, OR

Dean Clark, DC


Dr. Dean Clark is a doctor of chiropractic and creator of several pain relief products. Throughout his 30+ years of practice he has worked with Olympic athletes, weekend warriors, and everyone in between!

  • 2000, 2008, 2012, 2016 Olympic Team Medical Staff member
  • Board Certified in Sports Injuries and Infrared Imaging
  • Published researcher of pain relief products
  • Published author of manuals and applications regarding low level lasers
  • Former Track and Cross Country coach at Stanford University and Oregon State University

SE Portland, OR

John Helton, DC


Though it was gradually revealed to me, by 25 years of age, it became very clear that my life calling of service was to offer healing through chiropractic and nutrition.

My first teacher in healing was my father, a general surgeon, who taught me compassion, loving-kindness, perseverance, dedication to excellence, and, of course, bedside manners. During summer vacation from college, I had an opportunity to observe my father perform two surgeries. Though impressed with his skills, I was left with the feeling that it would be far better to help people before they required such medical intervention.

After graduating from Yale University in 1972 with a degree in American Studies, the next great teacher was Pierre Pannetier, designated by Dr. Randolph Stone, DC, DO, to carry on his work of teaching polarity therapy. Pierre’s greatest teaching to me was to always touch with love. Many teachers have followed, including Dr, N.W. Walker and Dr. Bernard Jensen in nutrition and iridology. Studies in herbology and homeopathy and practices in yoga, Taichi, Chi Kung and meditation all have contributed to my approach and philosophy of healing.

In 1980 I graduated from Western States Chiropractic College in Portland, Oregon, and have been in active chiropractic practice in Portland for 33 years.; I studied with many chiropractic teachers of different techniques: cranio-sacral-occipital technique and craniopathy, applied kinesiology, spinal column stressology, motion palpation, upper cervical specific techniques, (e.g., Palmer, HIO, Blair, Sweat),Chiropractic Biophysics, Chiropractic soft tissue techniques, Bowen procedures, contact reflex analysis, nutritional response testing, morphogenic field analysis, activator and integrator technique, orthobionomy, alphabiotics, functional neurology, functional medicine, and quantum neurology to name some. My dedication to excellence continues.