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

Dr. John Nathaniel Greene Jr., PHD

Individual provider Addiction (Substance Use Disorder) Psychologist · NPI 1396309076

Dr. John Nathaniel Greene Jr., PHD is an Addiction (Substance Use Disorder) Psychologist in Milwaukee, Wisconsin. Practices as a sole proprietor. Licensed in Wisconsin.

Licensed in
WI
In the registry since
2019
Specialties on file
7
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

6100 N 42nd St
Milwaukee, WI 53209-3560
Phone: (414) 449-1546
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 3678-57 (WI)
Addiction (Substance Use Disorder) Psychologist Taxonomy 103TA0400X · Licence 3678-57 (WI)
Cognitive & Behavioral Psychologist Taxonomy 103TB0200X · Licence 3678-57 (WI)
Clinical Child & Adolescent Psychologist Taxonomy 103TC2200X · Licence 3678-57 (WI)
Forensic Psychologist Taxonomy 103TF0200X · Licence 3678-57 (WI)
Intellectual & Developmental Disabilities Psychologist Taxonomy 103TM1800X · Licence 3678-57 (WI)
Group Psychotherapy Psychologist Taxonomy 103TP2701X · Licence 3678-57 (WI)

Record details

NPI number1396309076
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedApril 27, 2019
Last updated in NPPESMay 9, 2019

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