Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Jonathan A Leff, MD

Individual provider Research Study Specialist · NPI 1538407721

Dr. Jonathan A Leff, MD is a Research Study Specialist in Menlo Park, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2013
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

178 Seminary Dr
Menlo Park, CA 94025-3569
Phone: (650) 521-0353
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Research Study Specialist (primary) Taxonomy 1744R1102X · Licence G86872 (CA)

Record details

NPI number1538407721
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJanuary 22, 2013
Last updated in NPPESJanuary 22, 2013
Mailing address178 Seminary Dr, Menlo Park, CA 94025-3569

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