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.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

466 Commonwealth Ave Ste 201B
Boston, MA 02215-2721
Phone: (617) 859-5806
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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
Mailing address466 Commonwealth Ave, Suite 201b, Boston, MA 02215-2721

Other providers in Boston