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Ronald Eleious Williams, MD

Photo of Ronald Eleious Williams, MD

My specialty:
Ped Neonatology

My provider affiliation:
Kaiser Permanente provider

I speak: English

My gender: Male


Find out about

Where I practice

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  • Pharmacy services
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About me

Welcome to my world of pediatrics and neonatology, the world of children and newborns from ages that start at birth through 18 years old. I look forward to being of help to you and your family. If you follow my directions consistently, give me feedback if I miss the mark, love your child(ren) and give being a parent your best shot -- and maintain a decent sense of humor -- then we will have a remarkable time together as we strive for excellence and give our best efforts to those who need our care.


I am a native of California and grew up in central Los Angeles. UC Santa Cruz was my launching pad into the world of medicine where I received my bachelor's in biology. I stayed in the University of California system and attended UC San Diego for medical school, then completed my pediatric training at Children's Hospital Los Angeles. My son and his wife have two children, so I am now living in the world of grandparenting. My daughter has started her career as a photographer and loves her choice. I admire her courage, creativity, and work ethic. My wife and I are celebrating our 31st year of marriage, while she labors to put the finishing touches on her PhD in Organizational Education, one of her life's goals.

About my practice

My module team of medical assistants, licensed vocational nurses, and medical colleagues have a tremendous work ethic and sense of mutual support. They are my office's heart and soul of care and make any success I have in treating my patients and families possible. I am a general pediatrician who has expertise working in the neonatal intensive care nursery. I also have added expertise in treating people with asthma and learning behavior challenges. This mix of work keeps me intellectually stimulated and enthusiastic about my practice. Currently I am the Pediatric Asthma Champion and work hand in hand with our very supportive clinical pharmacist and other Fontana Medical Center asthma specialists of all stripes. I am serving my second term as the Fontana/Ontario representative on our Regional Retirement Committee, and I also support our physician staff as co-chair of our local Physician Thrive Council.

How I thrive

Whenever possible, I practice the advice I share with my patients and their families. I am working continuously to keep my weight in check, keep physically active through a number of sports activities, spend quality time with my family, and pursue professional and spiritual goals regularly. All areas are uniquely important; the challenge is keeping it all in balance at the right time. I enjoy my career, the people I work with, and Kaiser Permanente, which has provided me with the system to express my unique approach to medicine and life. Stay well.

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My office

Languages spoken by medical staff

Help is available in your language. Learn more.

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My provider type

Physicians and Surgeons

Medical groups and plans

Southern California Permanente Medical Group

List Header Plans Accepted
  • Exclusive Provider Organization (EPO)
  • HMO
  • Medi-Cal Managed Care
  • Point-of-Service Plan (POS)
  • Senior Advantage/Medicare Cost
Pediatrics Department
9961 Sierra Ave, Fontana, CA 92335

Contact information

  • Appointments/information
  • 1-833-574-2273 (1-833-KP4CARE) (toll free)
  • Information
  • 1-866-735-2922 (toll-free TTY for the hearing/speech impaired)

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My training, certifications and licensing

Medical school

UC San Diego School of Medicine
San Diego , CA

Board certification


American Board of Pediatrics

Medical training



Childrens Hospital of Los Angeles
Los Angeles , CA



Childrens Hospital of Los Angeles
Los Angeles , CA

Joined Permanente Medical Group


Active license information

License number


License type


License issuing state


National Provider Identifier (NPI)

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My hospitals

All Kaiser Permanente physicians and podiatrists have admitting privileges or the ability to refer patients to our plan hospitals. Admitting privileges of other providers may vary by plan and facility. Contact your plan administrator for details.

9961 Sierra Ave, Fontana, CA 92335

I have admitting privileges at this hospital.

Setting the standard: Measuring care quality in our hospitals(PDF)

2295 S Vineyard Ave, Ontario, CA 91761

I have admitting privileges at this hospital.

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To find:

  • a provider's office hours, search our facility directory
  • providers in your plan or accepting new patients, call 1-800-464-4000 (toll free) or 711 (TTY for the hearing/speech impaired)

The information in this online directory is updated periodically. The availability of physicians, hospitals, providers, and services may change. Information about a practitioner is provided to us by the practitioner or is obtained as part of the credentialing process. If you have questions, please call us at 1-800-464-4000 (toll free). For the hearing and speech impaired: 1-800-464-4000 (toll free) or TTY 711 (toll free). You can also call the Medical Board of California at 916-263-2382, or visit their website.

We want to speak to you in the language that you’re most comfortable with when you call or visit us. Qualified interpreter services, including sign language, are available at no cost, 24 hours a day, 7 days a week during all hours of operations at all points of contact. We do not encourage the use of family, friends or minors as interpreters. Only the services of interpreters and qualified staff are used to provide language assistance. These may include bilingual providers, staff, and healthcare interpreters. In-person, telephone, video, and alternative modes of communication are available. Learn more about interpreter services

If you would like to report an error in provider or facility information, please contact us.

Kaiser Permanente enrollees have full and equal access to covered services, including enrollees with disabilities as required under the Federal Americans with Disabilities Act of 1990 and Section 504 of the Rehabilitation Act of 1973.

Kaiser Permanente uses the same quality, member experience, or cost-related measures to select practitioners and facilities in Marketplace Silver-tier plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business.The measures may include, but are not limited to, HEDIS/CAHPS performance, member/patient complaints, patient safety scores, hospital quality measures, and geographic need. Members enrolled in KFHP Marketplace plans have access to all professional, institutional and ancillary health care providers who participate in KFHP plans’ contracted provider network, in accordance with the terms of members’ KFHP plan of coverage. All Kaiser Permanente Medical Group physicians and network physicians are subject to the same quality review processes and certifications.
Kaiser Permanente uses the same geographic distribution consideration to select hospitals in Marketplace plans as it does for all other Kaiser Foundation Health Plan (KFHP) products and lines of business. Accessibility of medical offices and medical centers in this directory: All Kaiser Permanente facilities are accessible to members.


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