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

Stephen R. Knowlton, PHD

Individual provider Psychologist · NPI 1336291004

Stephen R. Knowlton, PHD is a Psychologist in Boston, Massachusetts. Practices as a sole proprietor. Licensed in Massachusetts.

Licensed in
MA
In the registry since
2007
Specialties on file
2
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

466 Commonwealth Ave Ste 201B
Boston, MA 02215-2721
Phone: (617) 859-5806
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 6510 (MA)
Psychologist Taxonomy 103T00000X · Licence 6510 (MA)

Record details

NPI number1336291004
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedJanuary 16, 2007
Last updated in NPPESSeptember 11, 2025

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