| Deborah Potvin | Ph.D. | Yes | | | - District of Columbia
- Maryland
- Virginia
| |
| Jeffrey Powel | Ph.D. | No | | | | |
| Kristin B Powell | Ph.D. | Yes | | 6-55 | | |
| Matthew R. Powell | Ph.D. | Yes | | | | |
| Sarah Powell | Ph.D. | Yes | | children, adolescents, young adults | | |
| Stephanie K Powell | Ph.D. | Yes | | | | |
| Thomas E. Preston | Ph.D. | Yes | | 0-100 | | |
| George P. Prigatano | Ph.D. | Yes | | 6 - geriatric | | |
| Margaret Primeau | Ph.D. | No | | | | |
| Zoe E Proctor-Weber | Ph.D. | Yes | | 18+ | | |
| Daniel Proto | Ph.D. | Yes | | 18+ | | |
| Dalin T. Pulsipher | Ph.D. | Yes | | 3+ | | |
| Arnold D. Purisch | Ph.D. | Yes | | older children, adolescents, adults and older adults | | |
| Robert L. Pusakulich | Ph.D. | No | | | | |
| Crystal G Quinn | Ph.D. | Yes | | | | |
| Alona Ramati | Ph.D. | Yes | | 18+ | | |
| Philip Louis Rambo | Ph.D. | Yes | | 18+ | | |
| Maya Ramirez | Ph.D. | Yes | | | | |
| John J. Randolph | Ph.D. | Yes | | 10-100 | | |
| Shruti P Rane | Ph.D. | Yes | | 0-22 | | |
| Danielle M Ransom | Psy.D. | Yes | | Pediatric | | |
| Sarah A. Raskin | Ph.D. | Yes | | | | |
| Yuri Rassovsky | Ph.D. | Yes | | | | |
| Srishti Rau | Ph.D. | Yes | | 5-22 | - District of Columbia
- Maryland
- Virginia
| |
| Rebecca H. Rausch | Ph.D. | No | | | | |