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
Mailing address1310 Solar Dr, Waterloo, IA 50701-2463