| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| Sloman, Glenn | Florida Psychological Center | Psychologist | Indialantic | United States | Florida | View |
| Slepukhina, Daria | Private Practice | MD | Almaty | Kazakhstan | | View |
| Slayden, Sara | Self -employed | Licensed Marriage and Family Therapist | Los Angeles | United States | California | View |
| Slaughter, Jennifer | Relational Psychotherapy, PLLC | LCSW-S | Houston, TX | United States | Texas | View |
| Slater, Sonya | True North Counseling Group | Psychologist | Dublin | United States | Ohio | View |
| Slater, Regan | VA Eastern Kansas Health Care System | Psychologist | Shenandoah | United States | Iowa | View |
| Skvortsov, Ilya | AKPN | psychologist | Moscow | Russian Federation | Moskva | View |
| Skriver, Anette | Private Praxis | Clinical Psychologist | Aarhus | Denmark | Århus | View |
| Skow, Christine | Liberty Therapy Associates, LLC | Counselor | Coralville | United States | Iowa | View |
| Skon, Evelyn | L Evelyn Skon, MBA, MA, LMFT | Coach & Psychotherapist | Salt Lake City | United States | Utah | View |
| Skinta, Matthew | Roosevelt University | Assistant Professor | Chicago | United States | Illinois | View |
| Skidmore, Terry | Psychotherapy Private Practice | Psychotherapist with own private practice | Bribie Island | Australia | Queensland | View |
| Sisti, Mark | NY Cognitive - Behavioral, PLLC | Psychologist & Director | NY | United States | New York | View |
| Sison, Alfred | Kaiser Permanente Hawaii | Clinical Psychologist | Honolulu | United States | Hawaii | View |
| Siqueira, José | private practise | Psychologist | Campinas | Brazil | Sao Paulo | View |
| Singer, David | Private Practice | Therapist | Staten Island | United States | New York | View |
| Sinclair, Michael | City Psychology Group | Consultant Counselling Psychologist / Clinical Director | London | United Kingdom | | View |
| Simsion, Daniel | Forensicare | Clinical Psychologist | Clifton Hill | Australia | Victoria | View |
| Simpson, Phillip | Hull University Teaching Hospitals NHS Trust | Clinical Health Psychologist | Cottingham | United Kingdom | East Riding of Yorkshire | View |
| Simpson, Peter | ahpra, aps | Psychologist | Manor Lakes | Australia | Victoria | View |
| Simpson, Kevin | British Psychological Society | Clinical Psychologist | Kendal | United Kingdom | Cumbria | View |
| Simons, Patricia | Carpe Diem Counseling | Marriage & Family Therapist | Cross Junction | United States | Virginia | View |
| Simons, Joseph | Home | Counseling Psychologist | Cross Junction | United States | Virginia | View |
| Simons, Joe | VA | IOP | Youngstown | United States | Ohio | View |
| Simonich, Hugh | Austin State Supported Living Center | Clinical Behavior Analyst | Austin | United States | Texas | View |
| Simms, Rachel | Loyola University Md / Stanton Psychotherapy | Psychologist | Columbia | United States | Maryland | View |
| Simms, Chelsea | UCLA + DMH Public Mental Health Partnership | Lead Community Mental Health Trainer | Portland | United States | Oregon | View |
| Simmons, Elizabeth | Loyola University Medical Center | Associate Professor | Chicago | United States | Illinois | View |
| Simmons, Amanda | Mental Health Center of Denver | Staff Psychologist | Denver | United States | Colorado | View |
| Simmert, Gerald | Msc | Psychologe | Wuerzburg | Germany | Bayern | View |
| Simister, Heather | St.Amant | Psychologist | Winnipeg | Canada | Manitoba | View |
| Simion-Florin, Simion | Romanian College of Psychologists | Counselling & Educational Psychologist | Cluj-Napoca | Romania | Cluj | View |
| Simeonova, Valeria | Private Practice | Counselor/Therapist | Varna | Bulgaria | Varna | View |
| Sim, Rachael | NZPsS | Clinical Psychologist | Blenheim | New Zealand | Marlborough | View |
| Silvestri, Ramon | FACCAT | Professor/ Psychotherapist | Porto Alegre | Brazil | Rio Grande do Sul | View |
| Silvers, Sherry | Sherry Silvers, MSW, LCSW | LCSW | CHICAGO | United States | Illinois | View |
| Silverman, Michael | Icahn School of Medicine at Mount Sinai | Associate Professor | New York | United States | New York | View |
| Silverberg, Jason | Center for Emotional Health, Cherry Hill, NJ | Clinical Psychologist | Cherry Hill | United States | New Jersey | View |
| Silver, Deborah | self | Behavior Analyst | Lawrenceville | United States | New Jersey | View |
| Silva, Matias | Uba | Licenciado en Psicologia | Buenso aires | Argentina | Capital federal | View |
| Silva, Eder | Maria Maria Espaço Saúde | Psicólogo Clínico | Vitória da Conquista | Brazil | Bahia | View |
| Silva, Camila | Consultorio particular | Psicóloga clínica | Ituiutaba | Brazil | Minas Gerais | View |
| Silva, Barbara | Fundacion Foro para la Salud Mental | Lic. Psicología | Moreno | Argentina | Buenos Aires | View |
| Silva, Amanda | Universidade de Brasília - UnB | master's degree in progress | | Brazil | Distrito Federal | View |
| Silberstein, Erica | Private Practice | Clinical Psychologist | New York | United States | New York | View |
| Silberstein Tirch, Laura | The Center for Compassion Focused Therapy | Clinical Psychologist | New York | United States | New York | View |
| Silberleitner, Nicola | Capio vårdcentral Sävja | Leg. psykolog, leg. psykoterapeut, specialist i psykologisk behandling och psykoterapi | Uppsala | Sweden | Uppsala län | View |
| Sikorski, Jonathon | Tria Orthopedics | Pain and Health Psychologist | Woodbury | United States | Minnesota | View |
| Sikkema, Teije | Mental Health | Coach | Leeuwarden | Netherlands | Friesland | View |
| Sigurðsson, Haukur | Haukur Sigurðsson sálfræðingur | Clinical Psychologist | Reykajvík | Iceland | Reykjavik | View |