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    Last Updated: 01/09/2026

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    MediFind found 45 doctor with experience in Williams Syndrome near Ontario, CA. Of these, 41 are Experienced, 3 are Advanced and 1 are Elite.

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    45 providers found
      Elite in Williams Syndrome

      Lucy R. Osborne
      Elite in Williams Syndrome

      Lucy R. Osborne
      1 King's College Circle, 
      Toronto, ON, CA 

      Lucy Osborne practices in Toronto, Canada. Ms. Osborne is rated as an Elite expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Williams Syndrome, Supravalvular Aortic Stenosis, West Syndrome, and Pulmonary Supravalvular Stenosis.

      Advanced in Williams Syndrome

      John S. Yeomans
      Advanced in Williams Syndrome

      John S. Yeomans
      Toronto, ON, CA 

      John Yeomans practices in Toronto, Canada. Mr. Yeomans is rated as an Advanced expert by MediFind in the treatment of Williams Syndrome. His top areas of expertise are Williams Syndrome and Schizophrenia.

      Advanced in Williams Syndrome

      Caroline Kinnear
      Advanced in Williams Syndrome

      Caroline Kinnear
      Toronto, ON, CA 

      Caroline Kinnear practices in Toronto, Canada. Ms. Kinnear is rated as an Advanced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Supravalvular Aortic Stenosis, Primary Immunodeficiency (PID), Williams Syndrome, and Pulmonary Supravalvular Stenosis.

      Learn about our expert tiers
      Advanced in Williams Syndrome

      Rosanna A. Weksberg
      Advanced in Williams Syndrome

      Rosanna A. Weksberg
      555 University Avenue, M5G 1×8, 
      Toronto, ON, CA 

      Rosanna Weksberg practices in Toronto, Canada. Ms. Weksberg is rated as an Advanced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Hemihyperplasia, Macroglossia, Sotos Syndrome, and Beckwith-Wiedemann Syndrome.

      Astrid Guttmann
      Experienced in Williams Syndrome

      Astrid Guttmann
      Experienced in Williams Syndrome

      Astrid Guttmann
      2075 Bayview Avenue, G106, 
      Toronto, ON, CA 

      Astrid Guttmann practices in Toronto, Canada. Ms. Guttmann is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Neonatal Abstinence Syndrome, Medium-Chain Acyl-CoA Dehydrogenase Deficiency, COVID-19, Severe Acute Respiratory Syndrome (SARS), and Gastrostomy.

      Experienced in Williams Syndrome

      James L. Ellis
      Experienced in Williams Syndrome

      James L. Ellis
      Guelph, ON, CA 

      James Ellis practices in Guelph, Canada. Ellis is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Their top areas of expertise are Rett Syndrome, Williams Syndrome, Autism Spectrum Disorder, and Supravalvular Aortic Stenosis.

      Experienced in Williams Syndrome

      Glenville D. Jones
      Experienced in Williams Syndrome

      Glenville D. Jones
      Kingston, ON, CA 

      Glenville Jones practices in Kingston, Canada. Mr. Jones is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. His top areas of expertise are Hypercalcemia, Milk-Alkali Syndrome, Hypervitaminosis D, and Nephrocalcinosis.

      Experienced in Williams Syndrome

      Marielle S. Deurloo
      Experienced in Williams Syndrome

      Marielle S. Deurloo
      1 King's College Circle, 
      Toronto, ON, CA 

      Marielle Deurloo practices in Toronto, Canada. Ms. Deurloo is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Cerebral Hypoxia and Williams Syndrome.

      Experienced in Williams Syndrome

      Zhong-ping G. Feng
      Experienced in Williams Syndrome

      Zhong-ping G. Feng
      1 King's College Circle, 
      Toronto, ON, CA 

      Zhong-ping Feng practices in Toronto, Canada. Feng is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Their top areas of expertise are Cerebral Hypoxia, Stroke, Astrocytoma, and Williams Syndrome.

      Experienced in Williams Syndrome

      Zhengping X. Jia
      Experienced in Williams Syndrome

      Zhengping X. Jia
      Toronto, ON, CA 

      Zhengping Jia practices in Toronto, Canada. Jia is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Their top areas of expertise are Memory Loss, Autism Spectrum Disorder, Williams Syndrome, and Focal or Multifocal Malformations in Neuronal Migration.

      Experienced in Williams Syndrome

      Martin Kaufmann
      Experienced in Williams Syndrome

      Martin Kaufmann
      Kingston, ON, CA 

      Martin Kaufmann practices in Kingston, Canada. Mr. Kaufmann is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. His top areas of expertise are Hypercalcemia, Milk-Alkali Syndrome, Hypervitaminosis D, Nephrocalcinosis, and Mastectomy.

      Experienced in Williams Syndrome

      Sandar Min
      Experienced in Williams Syndrome

      Sandar Min
      Toronto, ON, CA 

      Sandar Min practices in Toronto, Canada. Ms. Min is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Pulmonary Supravalvular Stenosis, Supravalvular Aortic Stenosis, Hypertrophic Cardiomyopathy (HCM), and Pulmonary Valve Stenosis.

      Experienced in Williams Syndrome

      Celeste Leung
      Experienced in Williams Syndrome

      Celeste Leung
      Toronto, ON, CA 

      Celeste Leung practices in Toronto, Canada. Ms. Leung is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Autism Spectrum Disorder, Williams Syndrome, Fragile X Syndrome, and Alzheimer's Disease.

      Experienced in Williams Syndrome

      Malgorzata J. Nowaczyk
      Experienced in Williams Syndrome

      Malgorzata J. Nowaczyk
      Hamilton, ON, CA 

      Malgorzata Nowaczyk practices in Hamilton, Canada. Ms. Nowaczyk is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Smith-Lemli-Opitz Syndrome, Hirsutism in Women, Wiedemann-Steiner Syndrome, and Williams Syndrome.

      Experienced in Williams Syndrome

      David A. Chiasson
      Experienced in Williams Syndrome

      David A. Chiasson
      Toronto, ON, CA 

      David Chiasson practices in Toronto, Canada. Mr. Chiasson is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. His top areas of expertise are Pulmonary Supravalvular Stenosis, Supravalvular Aortic Stenosis, Cri-Du-Chat Syndrome, Sudden Infant Death Syndrome (SIDS), and Heart Transplant.

      Experienced in Williams Syndrome

      Hiroshi Otsubo
      Experienced in Williams Syndrome

      Hiroshi Otsubo
      555 University Ave, 
      Toronto, ON, CA 

      Hiroshi Otsubo practices in Toronto, Canada. Mr. Otsubo is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. His top areas of expertise are Epilepsy, Seizures, Cortical Dysplasia, Epilepsy in Children, and Deep Brain Stimulation.

      Experienced in Williams Syndrome

      Victoria M. Siu
      Experienced in Williams Syndrome

      Victoria M. Siu
      London, ON, CA 

      Victoria Siu practices in London, Canada. Ms. Siu is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Hypotonia, Polyhydramnios, Rett Syndrome, and Cornelia De Lange Syndrome.

      Experienced in Williams Syndrome

      Cheryl Cytrynbaum
      Experienced in Williams Syndrome

      Cheryl Cytrynbaum
      Toronto, ON, CA 

      Cheryl Cytrynbaum practices in Toronto, Canada. Ms. Cytrynbaum is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Sotos Syndrome, Hemihyperplasia, Hypoparathyroidism, and Weaver Syndrome.

      Experienced in Williams Syndrome

      Laura K. Cirelli
      Experienced in Williams Syndrome

      Laura K. Cirelli
      Toronto, ON, CA 

      Laura Cirelli practices in Toronto, Canada. Ms. Cirelli is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top area of expertise is Williams Syndrome.

      Experienced in Williams Syndrome

      Marjorie Brand
      Experienced in Williams Syndrome

      Marjorie Brand
      Ottawa, ON, CA 

      Marjorie Brand practices in Ottawa, Canada. Ms. Brand is rated as an Experienced expert by MediFind in the treatment of Williams Syndrome. Her top areas of expertise are Dyserythropoietic Anemia and Thrombocytopenia, Transient Erythroblastopenia of Childhood, Pure Red Cell Aplasia, and Aase Syndrome.

      While we make every effort to provide the best results possible, data is currently limited outside of the United States. Doctors listed may include both clinicians and researchers, and individuals relocate frequently. We recommend contacting doctors directly to confirm their location and areas of focus. Contact information is provided when available. Learn more about our expert tiers.
      Showing 1-20 of 45

      Last Updated: 01/09/2026

      What is the definition of Williams Syndrome?

      Williams syndrome is a rare disorder that can lead to problems with development.

      When should I see a Williams Syndrome doctor in Ontario, CA?

      There are various reasons why you may want to see a specialist, such as: 

      • Your primary care provider recommends it. 
      • Your condition requires expert knowledge and specialized care. 
      • Your symptoms persist or worsen despite treatment. 
      • You need specialized testing or procedures. 
      • You want a second opinion.  

      What should I consider when choosing a Williams Syndrome doctor in Ontario, CA?

      It’s important to see a provider with expertise in your specific condition. Each provider profile in MediFind’s doctor database includes information on which conditions they treat, years of experience, research contributions, languages spoken, insurance plans accepted, and more.  

      How do I find the best Williams Syndrome doctor in Ontario, CA?

      You can find a Williams Syndrome doctor in any of the 10 largest U.S. cities by clicking below:

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      Williams Syndrome doctor near San Jose, CA

      How does MediFind rank Williams Syndrome doctors in Ontario, CA?

      MediFind’s rankings are based on a variety of data sources, such as the number of articles a doctor has published in medical journals, participation in clinical trials and industry conferences, as well as the number of patients that provider sees for a given condition. Note that MediFind’s provider database is not based on user reviews, and providers do not pay to be included in the database. 

      What types of insurance are accepted by Williams Syndrome doctors in Ontario, CA?

      Most profiles in MediFind’s doctor database include a list of insurance plans accepted by that provider. However, it’s a good idea to contact the provider’s office to make sure they still accept your insurance, then doublecheck by contacting your insurance plan to confirm they’re in network. 

      How can I book an appointment online with a Williams Syndrome doctor in Ontario, CA?

      MediFind offers direct scheduling for certain providers using the “Request Appointment” button on that provider’s profile. If the schedule option is not available for a provider, tap the red “Show Phone Number” button on their profile to get their contact information. If you prefer to find providers who offer online scheduling, select “Schedules online” under the “Availability” category of the filter feature on the left side of the Williams Syndrome doctor search results page. 

      Why is it important to get a second opinion from a different Williams Syndrome doctor?

      Second opinions are an opportunity to confirm a diagnosis and its root cause, learn about alternative treatment options, or simply gain peace of mind. Many people, especially those with serious diagnoses, get second opinions so they can understand all their options and make informed decisions, so don’t hesitate to get one if you have any doubts or need more information or clarification regarding your care. Note that some insurance plans require second opinions, while others don’t cover second opinions, so be sure to confirm with your insurance provider first.   

      How can I prepare for my appointment with a Williams Syndrome doctor in Ontario, CA?

      Prepare for your appointment by gathering the following items: 

      • Copies of medical records (dating back at least one year) 
      • Your medical history, including illnesses, medical conditions, surgeries, and other doctors you see 
      • Family history of disease 
      • List of current prescription drugs, over-the-counter medicines, vitamins, and herbal remedies or supplements including names and doses 
      • Allergies to medications, food, latex, insects, etc.  
      • List of questions and concerns 
      • Your insurance card 

      You might also contact the provider’s office to see if they offer transportation or childcare services or if you’re allowed to bring a loved one for support or to take notes during your visit. 

      What questions should I ask my Williams Syndrome doctor?

      Here are some sample questions: 

      • Can you explain in simple terms what this condition is and how it’s treated? 
      • What symptoms or side effects should I watch for? 
      • What tests will be involved, and when can I expect results? 
      • Are there other specialists I need to see? 
      • What’s the best way to reach you if I have follow-up questions? 

      How can I learn about the latest clinical trials and research advances my Williams Syndrome doctor may know about?

      MediFind’s Clinical Trials tool asks you a series of questions to help you narrow down your search by health condition, age, gender, location, how far you’re willing to travel, and more. Each question you answer filters down the number of trials until you find the ones that are most relevant to you. 

      MediFind’s Latest Advances tool features summaries of recent articles published in medical journals. We use cutting-edge technology to scour medical publication databases for the latest research advancements on any given condition, then we simplify this information in a way that’s useful and easy to understand. 

      Can I filter my search to show male or female Williams Syndrome doctors in Ontario, CA?

      Look for the filter feature on the left side of the Williams Syndrome doctor search results page. Select “Female” or “Male” under the “Gender” category to search for female or male providers exclusively. If the “Any” option is selected, it will pull results for both male and female providers. 

      Can I filter my search to find a Williams Syndrome doctor that offers video calls?

      Look for the filter feature on the left-side of the Williams Syndrome doctor search results page. Select “Offers telehealth visits” under the Availability category to search for providers who offer virtual appointments (video calls). 

      Reviewed on: 11/11/24  

      By: MediFind Medical Staff 

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