Meet Our Addiction Specialists

Bringing compassion, skill, and knowledge to your recovery.

Fred Von Stieff, M.D., M.B.A.

Your addiction medicine physician in Concord.

doctors in concord ca - Dr. Von Stieff with a patient and in a headshot

Caring For All Your Needs

Dr. Von Stieff uses a holistic approach to addiction recovery. Through his research and 25 years of experience, he has identified the need to prioritize your physical and emotional needs. By using a medical model, your caring doctor shows how addiction is a disease and not something you should be blamed for.

As part of his approach, Dr. Von Stieff will ensure you are comfortable and will get to know you as an individual. He loves to show his fun side too and keeps his patients in good spirits.

Over his career, he has become famed for his pioneering treatments, highlighting how addiction can be corrected by “balancing your brain.” This method refers to caring for the mental side of addiction, not just trying to cater for the physical implications.

In fact, he knows so much about this subject he wrote a book about it.


  • Board-certified Addictionologist
  • 25 years experience with Addiction Medicine
  • Performed over 30,000 detoxifications
  • Medical director of Chemical Dependency at John Muir Center for Recovery
  • San Francisco Magazine has rated Dr. Von Stieff as one of the top 1% of doctors in the Bay Area


  • Graduate of the University of California
  • Graduate of the Irvine School of Medicine
  • 3-year Family Practice residency at the University of California, Davis


  • American Society of Addiction Medicine
  • American Board of Family Medicine

Kristi Carpenter, D.O., M.B.A.

With you every step of the way.

doctors in concord ca - Dr. Carpenter in a headshot and with her little girl

Treating the Whole Person

Dr. Kristi Carpenter views it as a privilege to work with patients of all backgrounds and ages. As an experienced family and addiction physician, she cares for you and your affected family members. Dr. Carpenter understands the impact your family can have on your journey to recovery, so she sets time aside to discuss their needs and concerns too. She makes them feel part of our team and part of our family.

Speaking of family, she follows in her father’s footsteps (Dr. Von Stieff) by treating the whole person and making sure you have all the information you need. Dr. Carpenter feels it is vital for you to feel comfortable and in a place of trust, so she builds up that rapport before starting any treatment.

When you are ready to start your recovery, our compassionate doctor will do all she can to help you achieve your goal.


  • Trained in Addiction Medicine
  • Years of experience working with Dr. Von Stieff
  • Board-certified Family Practice Physician
  • Experience caring for patients at Center for Recovery


  • Earned her Bachelor of Science degree in Biotechnology and with a minor in Sociology from the University of California, Davis
  • Master of Business from St. Mary’s College
  • Doctorate of Osteopathic Medicine degree from Touro University
  • 3-year Residency – University of California, Davis Network of Affiliated Family Practice Residency Program

Qualifications/ Memberships

  • American Society of Addiction Medicine
  • American Board of Family Medicine
  • American Academy of Family Physicians

“Dr. Von Stieff should be congratulated for his work in this field.”

– Actual Von Stieff Patient

Your Personal Recovery Team

Our inclusive office uses innovative care to get you on the road to recovery.

Concord Addiction Medicine Physician - Our caring team is here for you

Caring Team

We become your friends and guide you through the difficult times. Our compassionate yet fun team connects with you on a human level and provides support for your family too.
Concord Addiction Medicine Physician - We don't judge anyone, but care for them instead

No Judgment

First and foremost, addiction is a disease, so we never place the blame on you. Rather, we strive to get to the heart of the problem and help you overcome it.
Concord Addiction Medicine Physician - Everything is confidential

Complete Privacy

From our medical physicians to our social workers, each team member operates under complete confidentially as regulated by Federal Law. Nothing will be discussed without your written consent.
Concord Addiction Medicine Physician - Our fun team keeps things light

Are You Ready to Take Your First Step?