| Caleb P. Peck | Psy.D. | Yes | | 18 - 100 | | |
| Edward A. Peck III | Ph.D. | Yes | | | | |
| Russell D. Pella | Ph.D. | Yes | | | | |
| Shelley F. Pelletier | Ph.D. | Yes | | | | |
| Eugenio A. Peluso | Ph.D. | Yes | | Adult (18+) | | |
| Suzanne Penna | Ph.D. | Yes | | 18+ | | |
| Mary Pepping | Ph.D. | Yes | | 16 years of age and above for consultation questions | | |
| Jennifer Peraza | Psy.D. | Yes | | >18 years old | | |
| Carol C. Persad | Ph.D. | Yes | | 5yrs -geriatric | | |
| Joanna B. Peters | Psy.D. | Yes | | 0-30 | | |
| Christine L Petranovich | Ph.D. | Yes | | 0-21 | | |
| Vilija Petrauskas | Ph.D. | Yes | | children and adolescents | | |
| Vaishali Phatak | Ph.D. | No | | Adults | | |
| Richard Phenis | Psy.D. | Yes | | 16 and older | | |
| Laura K Phillips | Ph.D. | Yes | | 18-110 | | |
| Mark A Phillips | Ph.D. | Yes | | | | |
| Jacqueline Phillips-Sabol | Ph.D. | Yes | | 21-90 | | |
| Andrea Piatt | Ph.D. | Yes | | 18+ | | |
| Lawrence Pick | Ph.D. | Yes | - American Sign Language
- English
| School-Age Children - Older Adults | - District of Columbia
- Maryland
- New York
- Virginia
| |
| Christopher A Pierce | Ph.D. | Yes | | 20+ | | |
| Elizabeth M. Pieroth | Psy.D. | Yes | | pediatric and adult concussion/mTBI | | |
| Suzanne K. Pierson | Ph.D. | Yes | | Children and Adolescents | | |
| Irene Piryatinsky | Ph.D. | Yes | | 8-120 | | |
| Neil H. Pliskin | Ph.D. | Yes | | | | |
| Danielle M Ploetz | Ph.D. | Yes | | Toddlers, children, adolescents, and young adults | | |