| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| Marshall, Sarah | Australian Psychological Society (APS) | BSc (Hon), PhD. Psychologist in private practice | Sydney | Australia | New South Wales | View |
| Marshall, Stephen | Cambridge Psychology Group/McLean Hospital/Harvard Medical School | Clinical Psychologist | Arlington | United States | Massachusetts | View |
| Marston, Daniel | Marston Psychological Services | Clinical Psychologist | Monroeville | United States | Pennsylvania | View |
| Marszalek, Kristen | College of Registered Psychotherapists of Ontario | Registered Psychotherapist | Newmarket | Canada | Ontario | View |
| Martin-Garcia, Cristina | BACP | ACT and CBT Therapist | Edinburgh | United Kingdom | | View |
| Martin, Staci | National Cancer Institute | Psychologist/Senior Associate Scientist | Bethesda | United States | Maryland | View |
| Martinez Munive, Renzo | Universidad Privada del Norte | Psychologist | Lima | Peru | Lima | View |
| Martínez Ramírez, Ernesto | Instituto Mexicano de Terapias Basadas en Evidencia (IMTBE) | Director Académico | Nezahualcóyotl | Mexico | Mexico | View |
| MARTINEZ REY, MARÍA JOSE | si | PSICOLOGO | CIUDAD DE LA COSTA | Uruguay | Canelones | View |
| Martinez Rodriguez, Francisco | Clivi | Psicólogo Clínico y de la Salud | México | Mexico | Mexico | View |
| Martinez, Jacob | Private Practice | Licensed Professional Counselor | Milwaukee | United States | Wisconsin | View |
| Martínez, José | Instituto Peruano de Análisis Conductual EIRL | Director | Lima | Peru | Lima | View |
| Martinez, Laura | Miembro | Lic en psicología | Caba | Argentina | Capital federal | View |
| Martins, João | Modus Psicologia | Psychologist | João Pessoa | Brazil | Paraiba | View |
| Martins, Thais | Autarkia Clínica de Saúde | Clinical Psychologist | Sao Paulo | Brazil | Sao Paulo | View |
| Martz, Jan | FMH | Psychiatrist | Zürich | Switzerland | Zurich | View |
| Marzec, Mitchell | ACT Now Counseling | Licensed Professional Clinical Mental Health Counselor (LPCC) | Albuquerque | United States | New Mexico | View |
| Marzik, Estefania | psicologa | Psicologa | Buenos Aires | Argentina | Capital federal | View |
| Mas, Mariana | Práctica privada | Psiquiatra | Montevideo | Uruguay | Montevideo | View |
| Mashal, ABPP, Nehjla | Pacific Anxiety Group | Clinical Psychologist | San Francisco | United States | California | View |
| Mason, Erin | LCSW Private Practice | Psychotherapist, LCSW | Los Angeles | United States | California | View |
| Masterpasqua, Frank | Inst for Graduate Clinical Psychology, Widener University | Professor | Swarthmore | United States | Pennsylvania | View |
| Masterson Tilford, Stacy | Hamilton County Educational Service Center | Behavior Analyst | Cincinnati | United States | Ohio | View |
| Matacz- Szymanowicz, Iwona | NZOZ Diada NFZ Pyskowice, ODT Pozytywka | psychoterapeuta | Zabrze | Poland | śląskie | View |
| Mather, Doug | The Creation Company (2020) Ltd | Specialist in Human Behaviour | London | United Kingdom | London | View |
| Matheus, Daniela | CRP 08/12002 | Clinical Psychologist | Curitiba | Brazil | Parana | View |
| Mathew, LCSW, Charly | LCSW-C | LCSW | Davie | United States | Florida | View |
| Mathews, M.D., Pamela | Baylor Scott and White Health | adjunct professor in psychiatry | Temple | United States | Texas | View |
| Mathis, Kimberly | VA San Diego Healthcare System | Staff Psychologist | Chula Vista | United States | California | View |
| Matisz, Jenna | New Horizons Therapy | Registered Social Worker/Psychotherapist | Kitchener | Canada | Ontario | View |
| Matsen Devitt, Julie | D Waters and Associates LLC | Psychologist | Hazlet | United States | New Jersey | View |
| Matthijssen, Denise | Pivate practice | familytherapist and coach | Ingen | Netherlands | | View |
| Mattoli, Scarlett | Psynamo Limited | Director/Clinical Psychologist | Central | Hong Kong | Central and Western | View |
| Maxey, C. David | C. David Maxey, M.A. | Licensed Psychologist Associate | Portland | United States | Oregon | View |
| May, Robin | Australian Psychological Society, Australian Association of Smoking Cessation Specialists, Australian Association of Cognitive & | Psychologist | St Leonards | Australia | New South Wales | View |
| Maynard, Patricia | Tapestry Wellness Counseling Practice | Clinical Director | Memphis | United States | Tennessee | View |
| Mayo Sisternas, Sara | HCPC | Educational Psychologist/Psychotherapist | London | United Kingdom | London | View |
| Mayorga Oré, María del Rocío | Práctica privada | Psicóloga | Lima | Peru | Lima | View |
| Mays, Iain | Psychological Society of Ireland | Senior Clinical Psychologist | Cork | Ireland | Cork | View |
| Mazza, Marisa | choicetherapy | Psychologist | Berkeley | United States | California | View |
| Mazzei, Rae | Evolutions Behavioral Health Services | Health Psychologist | Chandler | United States | Arizona | View |
| Mazzeo, Gabriela | Equipo Fons | Psicoterapeuta | Bahía Blanca | Argentina | Buenos Aires | View |
| Mc Carroll, Paul | Northern Health Social Care Trust | ACT Coach/Therapist/ Peer Recovery Trainer | Belfast | United Kingdom | Co Antrim | View |
| McAnulty, David | Abilene Christian University | Professor of Psychology | Abilene | United States | Texas | View |
| McArdle, Paige | Children's Mercy Hospital | Psychologist | Overland Park | United States | Kansas | View |
| McArthur, Laurel | Resilience Clinical Psychology | Clinical Psychologist | Auckland | New Zealand | | View |
| McAulay, John | Mashall Health Psychiatry | Psychologist / Assistant Professor | Huntington | United States | West Virginia | View |
| McBeath, Jennifer | CCTNB | Counsellor | Moncton | Canada | New Brunswick | View |
| McBrain, Philip | Contact Awareness Counseling LLC | Mental Health Counselor | Boulder | United States | Colorado | View |
| McBroom, Callie | Inner Growth Counseling | LCSWA, CSW, LSSW | Chapel Hill | United States | North Carolina | View |