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Learn about our doctor expertise tiers.
If you have a rare or serious condition, you may want to seek advice from the best doctor you can find.
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Elite
  • Global leaders in their field
  • Publish in medical journals frequently
  • Speak at conferences
  • Participate in clinical trials
  • Likely to work with cutting edge treatments
  • Likely to hold leadership positions in their organization
Distinguished
  • Leaders in their field
  • Strong research portfolio
  • Likely to work with cutting edge treatments
  • Likely to be a leader in their field regionally
Advanced
  • Likely to be excellent at diagnosing and treating conditions
  • Treat many patients and have extensive experience in their field
  • Less likely to publish, speak at conferences, or participate in clinical trials
Experienced
  • Primarily treat patients
  • May be specialists or primary care physicians
  • Have great experience in diagnosing and treating conditions
  • Less likely to set themselves apart from peers by publishing, speaking at conferences, or participating in clinical trials
  • Majority of doctors fall within this rating
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3958 doctors found
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Elite
Neurology

Johns Hopkins University

600 N Wolfe St
 
Baltimore, MD 21287

Argye Hillis is a Neurologist in Baltimore, Maryland. Dr. Hillis has been practicing medicine for over 26 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. She is also highly rated in 16 other conditions, according to our data. Her top areas of expertise are Primary Progressive Aphasia, Stroke, Frontotemporal Dementia, and Apoplexy. She is board certified in Neurology and licensed to treat patients in Maryland. Dr. Hillis is currently accepting new patients.

Elite
Neurology

Ucsf Medical Group Business Services

400 Parnassus Ave
 
San Francisco, CA 94143

Gil Rabinovici is a Neurologist in San Francisco, California. Dr. Rabinovici has been practicing medicine for over 20 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 19 other conditions, according to our data. His top areas of expertise are Alzheimer's Disease, Dementia, Primary Progressive Aphasia, and Frontotemporal Dementia. He is board certified in Neurology and licensed to treat patients in California. Dr. Rabinovici is currently accepting new patients.

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Elite
Neurology

University Of Penn Medical Group

Philadelphia, PA 19104

David Irwin is a Neurologist in Philadelphia, Pennsylvania. Dr. Irwin has been practicing medicine for over 15 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 36 other conditions, according to our data. His top areas of expertise are Frontotemporal Dementia, Primary Progressive Aphasia, Dementia, and Lewy Body Dementia. He is board certified in Neurology and licensed to treat patients in Pennsylvania. Dr. Irwin is currently accepting new patients.

Elite
Neurology

The Regents Of The University Of California

300 Medical Plaza
 
Los Angeles, CA 90095

Mario Mendez is a Neurologist in Los Angeles, California. Dr. Mendez has been practicing medicine for over 47 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 29 other conditions, according to our data. His top areas of expertise are Frontotemporal Dementia, Dementia, Primary Progressive Aphasia, and Alzheimer's Disease. He is board certified in Neuropsychiatry and Neurology and licensed to treat patients in California. Dr. Mendez is currently accepting new patients.

Elite
Neurology

Ucsf Medical Group Business Services

400 Parnassus Ave
 
San Francisco, CA 94143

William Seeley is a Neurologist in San Francisco, California. Dr. Seeley has been practicing medicine for over 22 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 24 other conditions, according to our data. His top areas of expertise are Frontotemporal Dementia, Dementia, Primary Progressive Aphasia, and Alzheimer's Disease. He is board certified in Neurology and licensed to treat patients in California.

Elite
Neurology

Mayo Clinic

200 1st St Sw
 
Rochester, MN 55905

Keith Josephs is a Neurologist in Rochester, Minnesota. Dr. Josephs has been practicing medicine for over 24 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 29 other conditions, according to our data. His top areas of expertise are Apraxia, Primary Progressive Aphasia, Frontotemporal Dementia, and Developmental Dysphasia Familial. He is board certified in Neurology and licensed to treat patients in Minnesota. Dr. Josephs is currently accepting new patients.

Elite
Neurology

Ucsf Medical Group Business Services

400 Parnassus Ave
 
San Francisco, CA 94143

Adam Boxer is a Neurologist in San Francisco, California. Dr. Boxer has been practicing medicine for over 23 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 19 other conditions, according to our data. His top areas of expertise are Frontotemporal Dementia, Progressive Supranuclear Palsy Atypical, Progressive Supranuclear Palsy, and Supranuclear Ophthalmoplegia. He is board certified in Neurology and licensed to treat patients in California.

Elite

University Of Cambridge

Cambridge, ENG, GB 

Karalyn Patterson practices in Cambridge, United Kingdom. Dr. Patterson is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. She is also highly rated in 13 other conditions, according to our data. Her top areas of expertise are Primary Progressive Aphasia, Frontotemporal Dementia, Dementia, and Progressive Supranuclear Palsy Atypical.

Elite
Neurology

Massachusetts General Physicians Organization Inc

55 Fruit St
 
Boston, MA 02114

Bradford Dickerson is a Neurologist in Boston, Massachusetts. Dr. Dickerson has been practicing medicine for over 22 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 17 other conditions, according to our data. His top areas of expertise are Frontotemporal Dementia, Primary Progressive Aphasia, Dementia, and Alzheimer's Disease. He is board certified in Neurology and licensed to treat patients in Massachusetts. Dr. Dickerson is currently accepting new patients.

Elite

Hospital Clínico San Carlos

San Carlos Health Research Institute
 
Madrid, MD, ES 

Jordi Guiu-Matias practices in Madrid, Spain. Dr. Guiu-Matias is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. They are also highly rated in 17 other conditions, according to our data. Their top areas of expertise are Primary Progressive Aphasia, Dementia, Developmental Dysphasia Familial, and Multiple Sclerosis.

Elite
Neurology

Northwestern Medical Faculty Foundation

676 N Saint Clair St
 
Chicago, IL 60611

Marsel Mesulam is a Neurologist in Chicago, Illinois. Dr. Mesulam has been practicing medicine for over 49 years and is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 6 other conditions, according to our data. His top areas of expertise are Primary Progressive Aphasia, Frontotemporal Dementia, Dementia, and Alzheimer's Disease. He is board certified in Neurology and licensed to treat patients in Illinois. Dr. Mesulam is currently accepting new patients.

Elite

University College London

Dementia Research Centre, Department Of Neurodegenerative Disease
 
London, ENG, GB 

Jonathan Rohrer practices in London, United Kingdom. Dr. Rohrer is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 17 other conditions, according to our data. His top areas of expertise are Frontotemporal Dementia, Dementia, Primary Progressive Aphasia, and Alzheimer's Disease.

Elite

Scuola Universitaria Superiore IUSS Pavia

Pavia, IT 

Stefano Cappa practices in Pavia, Italy. Dr. Cappa is rated as an Elite doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 13 other conditions, according to our data. His top areas of expertise are Primary Progressive Aphasia, Dementia, Alzheimer's Disease, and Frontotemporal Dementia.

Distinguished
Neurology

Northwestern Medical Faculty Foundation

Chicago, IL 60611

Borna Bonakdarpour is a Neurologist in Chicago, Illinois. Dr. Bonakdarpour has been practicing medicine for over 21 years and is rated as a Distinguished doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 7 other conditions, according to our data. His top areas of expertise are Primary Progressive Aphasia, Gerstmann Syndrome, Cerebellar Degeneration, and Dementia. He is board certified in Neurology and licensed to treat patients in Illinois. Dr. Bonakdarpour is currently accepting new patients.

Distinguished
Radiology
Nuclear Medicine

Mayo Clinic

200 1st St Sw
 
Rochester, MN 55905

Val Lowe is a Radiologist and a Nuclear Medicine doctor in Rochester, Minnesota. Dr. Lowe has been practicing medicine for over 33 years and is rated as a Distinguished doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 17 other conditions, according to our data. His top areas of expertise are Alzheimer's Disease, Dementia, Lewy Body Dementia, and Primary Progressive Aphasia. He is board certified in Nuclear Medicine and licensed to treat patients in Minnesota. Dr. Lowe is currently accepting new patients.

Distinguished

University Of Sydney

Sydney, NSW, AU 

Cristian Leyton practices in Sydney, Australia. Dr. Leyton is rated as a Distinguished doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 5 other conditions, according to our data. His top areas of expertise are Primary Progressive Aphasia, Frontotemporal Dementia, Developmental Dysphasia Familial, and Alzheimer's Disease.

Distinguished
Neurology

Mayo Clinic

200 1st St Sw
 
Rochester, MN 55905

Bradley Boeve is a Neurologist in Rochester, Minnesota. Dr. Boeve has been practicing medicine for over 30 years and is rated as a Distinguished doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 32 other conditions, according to our data. His top areas of expertise are Lewy Body Dementia, Frontotemporal Dementia, Dementia, and Parkinson's Disease. He is board certified in Neurology and licensed to treat patients in Minnesota. Dr. Boeve is currently accepting new patients.

Distinguished

Université Laval

Quebec, QC, CA G1J2G

Joel Macoir practices in Quebec, Canada. Dr. Macoir is rated as a Distinguished doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 5 other conditions, according to our data. His top areas of expertise are Primary Progressive Aphasia, Memory Loss, Dementia, and Developmental Dysphasia Familial.

Distinguished
Neurology

Regents Of The University Of Claifornia Univ Neursciences

Orange, CA 92868

Seyed Sajjadi is a Neurologist in Orange, California. Dr. Sajjadi has been practicing medicine for over 19 years and is rated as a Distinguished doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 7 other conditions, according to our data. His top areas of expertise are Primary Progressive Aphasia, Frontotemporal Dementia, Cerebellar Degeneration, and Alzheimer's Disease. He is board certified in Neurology and licensed to treat patients in California. Dr. Sajjadi is currently accepting new patients.

Distinguished

University Of Sydney

Central Sydney Medical School And Brain & Mind Centre
 
Sydney, NSW, AU 

John Hodges practices in Sydney, Australia. Dr. Hodges is rated as a Distinguished doctor by MediFind in the treatment of Primary Progressive Aphasia. He is also highly rated in 18 other conditions, according to our data. His top areas of expertise are Frontotemporal Dementia, Dementia, Primary Progressive Aphasia, and Developmental Dysphasia Familial.

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What is the definition of Primary Progressive Aphasia?

Primary progressive aphasia (PPA) affects a person's ability to use language to communicate. This includes difficulty making or understanding speech (aphasia). PPA is a specific type of a more general disease called frontotemporal dementia. PPA can be classified into three distinct types which include:
  • Progressive non-fluent aphasia (PNFA)
  • Semantic dementia (SD)
  • Logopenic progressive aphasia (LPA)
PPA is caused by a loss of tissue (atrophy) in the area of the brain that is responsible for producing language. In some cases, this loss of tissue is caused by genetic changes (mutations or pathogenic variants) in the GRN gene. In these cases, the disease is inherited in an autosomal dominant manner. Diagnosis of PPA is suspected when a doctor observes signs and symptoms such as progressive loss of language abilities. Imaging of the brain with a CT scan or MRI can confirm the diagnosis. Although there is no cure for the disease, treatment options include speech therapy and medication to manage behavioral changes.

Behind the List

MediFind is the industry authority on identifying the leading medical experts and latest research in order to help patients facing complex health challenges, including , make better health decisions. Leveraging our expertise in natural language processing and machine learning across thousands of diseases, we uncover physicians who are leading authorities on . MediFind identifies these experts using proprietary world-class models that assess over 2.5 million global doctors based on a range of variables, including research leadership, patient volume, peer standing, and connectedness to other experts. Learn more about our methodology by exploring how MediFind works.