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

Dr. William Walter Clark, PHD

Individual provider Clinical Psychologist · NPI 1972716702

Dr. William Walter Clark, PHD is a Clinical Psychologist in Vienna, Virginia. Licensed in Virginia. Registered with an NPI since 2007.

Licensed in
VA
In the registry since
2007
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

2110 Gallows Rd # B
Vienna, VA 22182-3962
Phone: (703) 506-8378
Fax: (703) 893-1011
Show map & directions

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

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 0810002215 (VA)

Record details

NPI number1972716702
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedMay 8, 2007
Last updated in NPPESJuly 8, 2007
Mailing address1514 Thurber St, Herndon, VA 20170-2565

Other providers in Vienna