Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Justin Barrett Leaf, PHD, BCBA

Individual provider Behavior Analyst · NPI 1881995942

Dr. Justin Barrett Leaf, PHD, BCBA is a Behavior Analyst in Foristell, Missouri. Practices as a sole proprietor. Registered with an NPI since 2010.

In the registry since
2010
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.
BCBA — Board Certified Behavior Analyst
Designs and supervises applied behaviour analysis programmes, often for autism.

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Practice location Address checks out

19 Lexington Oaks Ct
Foristell, MO 63348-1479
Phone: (562) 221-8581
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Behavior Analyst (primary) Taxonomy 103K00000X

Record details

NPI number1881995942
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD , BCBA
Sole proprietorYes
NPI enumeratedNovember 5, 2010
Last updated in NPPESNovember 5, 2010
Mailing address19 Lexington Oaks Ct, Foristell, MO 63348-1479

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