| Name | Affiliation | Occupation / Position Title | City | Country | State | |
|---|
| Marshall, Stephen | Cambridge Psychology Group/McLean Hospital/Harvard Medical School | Clinical Psychologist | Arlington | United States | Massachusetts | View |
| Martel, Marie-Eve | private practice | Registered Psychologist | Vancouver | Canada | British Columbia | View |
| Martin, Angelica | Private Practitioner | Licensed Professional Counselor | New Orleans | United States | Louisiana | View |
| Martin, Dan | St Mary's University, Twickenham | Sport and Exercise Psychologist | Windsor | United Kingdom | | View |
| Martin, Deanna | Beech Acres Parenting Center | Licensed Professional Counselor, CR | Cincinnati | United States | Ohio | View |
| Martin, Fiona | takeACTion.me.uk | Counsellor/ Coach | Holywell | United Kingdom | Flintshire | View |
| Martin, Savanna | Aspen Valley Counseling Services | LPC | DUMFRIES | United States | Virginia | View |
| Martin, Staci | True North Therapy and Training | ACT Consultant and Trainer | Bethesda | United States | Maryland | View |
| Martin, Tyler | Acrasy Advisors | Managing Director | Denver | United States | Colorado | View |
| Martínez Ramírez, Ernesto | Instituto Mexicano de Terapias Basadas en Evidencia (IMTBE) | Director Académico | Nezahualcóyotl | Mexico | Mexico | View |
| Martinez Sanchez, Jose | LIBER TCC | PSYCHOTHERAPIST | Ciudad de México | Mexico | Distrito Federal | View |
| Martinez, Constanza | Aguilera | Psicóloga clínica independiente | Puerto Varas | Chile | Los Lagos | View |
| Martinez, Jacob | Private Practice | Licensed Professional Counselor | Milwaukee | United States | Wisconsin | View |
| Martinez, Laura | Miembro | Lic en psicología | Caba | Argentina | Capital federal | View |
| Martinez, Robin | RadEd Collective | BCBA | OAKLAND | United States | California | View |
| Martino-Harms, Justin | Concentric Psychological Services | Psychologist | Providence | United States | Rhode Island | View |
| Martins, João | Modus Psicologia | Psychologist | João Pessoa | Brazil | Paraiba | View |
| Martins, Karen | clinica | Psicóloga | Ponta Grossa | Brazil | | View |
| Martins, Maria João | Universidade de Coimbra | Psychologist | Coimbra | Portugal | Coimbra | View |
| Martz, Jan | SING | Psychiatrist | Zürich | Switzerland | Zurich | View |
| Marzec, Mitchell | ACT Now Counseling | Licensed Professional Clinical Mental Health Counselor (LPCC) | Albuquerque | United States | New Mexico | View |
| Mascaro, Nathan | Atlanta CBT | Psychologist | Atlanta | United States | Georgia | View |
| Mashal, ABPP, Nehjla | University of Jordan | Clinical Psychologist | Amman | Jordan | Amman | View |
| Maslinska, Anka | Otwarty Gabinet Terapeutyczny | Psychoterapeuta | Teulada | Spain | Alicante | View |
| Mason, Annette | Dept. of Veterans Affairs | LICSW | Saint Cloud | United States | Minnesota | View |
| Massey, Morgan | LifeStance | Mental Health Therapist | Edmond | United States | | View |
| Masterpasqua, Frank | Inst for Graduate Clinical Psychology, Widener University | Professor Emeritus | Swarthmore | United States | Pennsylvania | View |
| Mat Zin, Nora Binti | International Islamic University Malaysia | consultant psychiatrist | Kuantan | Malaysia | Pahang | View |
| Mata, Sofía | Private Practice | Psicoterapeuta | El Marqués | Mexico | Queretaro | View |
| Matacz- Szymanowicz, Iwona | NZOZ Diada NFZ Pyskowice, ODT Pozytywka | psychoterapeuta | Zabrze | Poland | śląskie | View |
| Matan, Adee | Private practice | Psychotherapist | Tel Aviv | Israel | | View |
| Matejcich, Nicole | Private | Psychologist | Capital Federal | Argentina | Buenos Aires | View |
| Mather, Doug | The Creation Company (2020) Ltd | Specialist in Human Behaviour | London | United Kingdom | London | View |
| Mathews, Marielle | Delaware County Center for Psychological Services LLC | Psychologist | Havertown | United States | Pennsylvania | View |
| Mathis, Kimberly | VA San Diego Healthcare System | Staff Psychologist | Chula Vista | United States | California | View |
| Matsen Devitt, Julie | Hopewell Psychology | Licensed Psychologist | King of Prussia | United States | Pennsylvania | View |
| Mattes, Josef | private practice & Universität Wien | Researcher, Psychotherapist, MBSR teacher, Feldenkrais teacher | Wien | Austria | | 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 |
| Mattos, Alexandre | Private office | Psychotherapist | Águas da Prata | Brazil | Sao Paulo | View |
| Maus-Chaudhury, Nicole | Finding Hope LLC | Therapist/Practice Owner | Ellicott City | United States | Maryland | View |
| Maviglia, Adrienne | ABAI | Clinical Executive Director | Goshen | United States | New York | View |
| Maxey, C. David | Portland Psychological Services | Licensed Independent Psychologist Associate | Portland | United States | Oregon | View |
| May, Robin | Australian Psychological Society, Australian Association of Smoking Cessation Specialists, Australian Association of Cognitive & | Psychologist | Royal North Shore Hospital | Australia | New South Wales | View |
| Mayaudon González, Enrique | Universidad Anáhuac | Psicólogo Clínico | Estado de México | Mexico | | View |
| Maynard, Patricia | Tapestry Wellness Counseling Practice | Therapist/Owner | MEMPHIS | United States | United States Minor Outlying Islands | View |
| Mazhyrina, Nataliia | Private Practice | Psychologist | Kyiv | Ukraine | | View |
| Mazurczak, Agnieszka | pomocnia | Ma in psychology | poznan | Poland | wielkopolskie | View |
| Mazza, Marisa | choicetherapy | Psychologist | Berkeley | United States | California | View |
| Mazzei, Rae | Evolutions Behavioral Health Services | Health Psychologist | Chandler | United States | Arizona | View |
