| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| Mawson, Emily | Barwon Health | Clinical Psychologist | Geelong | Australia | | View |
| Maxey, C. David | C. David Maxey, M.A. | Licensed Independent Psychologist Associate | Portland | United States | Oregon | View |
| May, Michael | Mandala House, LLC | Psychotherapist; Director of Supervision & Training | LOUISVILLE | United States | Kentucky | View |
| May, Robin | Australian Psychological Society, Australian Association of Smoking Cessation Specialists, Australian Association of Cognitive & | Psychologist | St Leonards | Australia | New South Wales | View |
| Mayberry, Emily | Sheffield Teaching Hospitals NHS Foundation Trust / University of Sheffield | Clinical Psychologist | Sheffield | United Kingdom | | View |
| Maynard, Patricia | Tapestry Wellness Counseling Practice | Therapist/Owner | MEMPHIS | United States | United States Minor Outlying Islands | 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 |
| 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 |
| Mazzeo, Gabriela | Equipo Fons | Psicoterapeuta | Bahía Blanca | Argentina | Buenos Aires | View |
| McAlpine, Lindi | British Psychological Society | Mindfulness-based Cognitive Therapist | Truro | United Kingdom | Cornwall | 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 | Appalachian Counseling Center | Psychologist / Assistant Professor | Huntington | United States | West Virginia | View |
| McCabe, D'Arcy | Private Practice | MSW, RSW, Social Worker, Psychotherapist | Toronto | Canada | Ontario | View |
| McCabe, Katie | Self-employed private practice | Therapist | Westport | United States | Connecticut | View |
| McCandless, James | BABCP | Cognitive Behavioural Psychotherapist | Wimbledon | United Kingdom | London | View |
| McCann, Sean | Helping Wind Wellness, LLC | Therapist | Philadelphia | United States | Pennsylvania | View |
| McCauley, Ellis | Private Psychology Practice | LMFT Psychotherapist Lic #52057 | Richmond | United States | California | View |
| McChesney, Kathleen | Vail Behavioral Health/University of Colorado Anschutz Medical Campus | Licensed Clinical Psychologist | Edwards | United States | Colorado | View |
| McConnell, Chris | APCP | Psychotherapist / Counsellor | Dublin | Ireland | | View |
| McCormack, Sarah | IACP | Psychotherapist | Co. Laois | Ireland | Laois | View |
| McCoul, Robert | Atlantic Behavioral Medicine, Inc | Licensed Psychotherapist | CONCORD | United States | New Hampshire | View |
| McCracken, Lance | Uppsala University | Professor of Clinical Psychology | Uppsala | Sweden | Uppsala län | View |
| McCurry, Chris | Self Employed Psychologist | Clinical Child Psychologist | Seattle | United States | Washington | View |
| McCurry, Susan | University of Washington/ABCD PLLC | Research Professor Emeritus/Psychologist | Seattle | United States | Washington | View |
| McCutcheon, Kevan | Private Psychology Practice | Clinical Psychologist | Peninsula | United States | Ohio | View |
| McDade-Montez, Elizabeth | Private Psychology Practice | Psychologist | Capitola | United States | California | View |
| McDermott, Sean | Sean P. McDermott, Ph.D. | Psychologist | Bayport | United States | New York | View |
| McDonald, Janelle | N/A | Business Owner/BCBA/LBA | Sterling | United States | Virginia | View |
| McDonald, Susan | EnhanceHR | Psychologist | Brisbane | Australia | Queensland | View |
| McDonald, Syn | Midwest Behavioral Services, Missouri Department of Mental Health | Behavior Analyst | Florissant | United States | Missouri | View |
| McDowell, Heather | auckland district health board | Consultant Clinical Psychologist | Auckland | New Zealand | | View |
| McElwee, John | self-employed | BCBA | Wilkes Barre | United States | Pennsylvania | View |
| McFadden, Emily | Childhood Solutions | Licensed Psychologist | Fort Washington | United States | Pennsylvania | View |
| McFee, Scott | Oregon State University, Private Practice | Professor of Practice, Therapist | Corvallis | United States | Oregon | View |
| McGarr-Knabke, Adina | clinical practice | Psychologist | Santa Barbara | United States | California | View |
| McGillivray, Helen | Compass Therapy Ltd | Psychological Therpist | Lochinver Lairg | United Kingdom | Midlothian | View |
| McGloin, Stephanie | Simmons college | BCBA Case Supervisor | Norwell | United States | Massachusetts | View |
| McGrath, Michelle | Seabury Resources for Aging and Private Practice | Clinical Social Worker | Silver Spring | United States | Maryland | View |
| McGraw, Lance | Therapy Austin | LPC-A | Austin | United States | Texas | View |
| McGregor, Jeremy | Homewood Health Centre | Psychotherapist | Guelph | Canada | Ontario | View |
| McGuinness, Carmen | Chrysalis Center for Change | Board Certified Behavior Analyst | Altamonte Springs | United States | Florida | View |
| McHugh, Louise | University College Dublin | Professor | Dublin | Ireland | | View |
| McInnis, Katherine | Peterborough Family Health Team | Registered Social Worker, Consultant | Peterborough | Canada | Ontario | View |
| McIntosh, Ross | City, University of London | Organisational & Coaching Psychologist | Gines | Spain | Sevilla | View |
| McKelvie, Meg | Self -employed Psychologist | Clinical Psychologist | Boulder | United States | Colorado | View |