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

Dr. John Eustis Williams, PHD

Individual provider Cognitive & Behavioral Psychologist · NPI 1346277829

Dr. John Eustis Williams, PHD is a Cognitive & Behavioral Psychologist in Waterloo, Iowa. Licensed in Iowa. Registered with an NPI since 2006.

Licensed in
IA
In the registry since
2006
Specialties on file
3
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 →

Practice location Address checks out

1310 Solar Dr
Waterloo, IA 50701-2463
Phone: (319) 232-2086
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 00960 (IA)
Cognitive & Behavioral Psychologist Taxonomy 103TB0200X
Health Psychologist Taxonomy 103TH0004X · Licence 000498 (IA)

Record details

NPI number1346277829
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedJune 28, 2006
Last updated in NPPESApril 12, 2021
Certification dateApril 12, 2021