| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| 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, Robin | Counseling Associates of America | Psychologist | Bonita Springs | United States | Florida | 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, 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 |
| 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 |
| McGregor, Rachel | Association for Behaviour Analysis Australia; Australian Psychological Society | Psychologist / Behaviour Analyst | Melbourne | Australia | Victoria | 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 |
| McKee, Lachlan | True North Psychology | Provisional Psychologist | Brisbane | Australia | Queensland | View |
| McKelvie, Meg | Self -employed Psychologist | Clinical Psychologist | Boulder | United States | Colorado | View |
| McKenzie, Fionn | Social worker | Social Worker | Lower Hutt | New Zealand | | View |
| McKinley, Mary | Veterans Healthcare Administration | Psychologist | Fort Worth | United States | Texas | View |
| McLauchlan, Tim | clinical psychologist | Clinical Psychologist | Canberra | Australia | Australian Capital Territory | View |
| McMahon, Tierney | Growing Minds Therapy | Clinical Psychologist | Chicago | United States | Illinois | View |
| McManamy, Melissa | American Counseling Association | LPC, ACC(ICF), Talent Strategist | KC, MO | United States | Missouri | View |
| McMillan, Sarah | Sarah Elizabeth McMillan, MA MSW RSW | Registered Social Worker | Etobicoke | Canada | Ontario | View |
| McNally, Julian | The ACT of Living | Counselling Psychologist | Melbourne | Australia | Victoria | View |
| McNeal, Kristi | KRISTI MCNEAL LLC | LSCSW | Wichita | United States | | View |
| McNutt, Jonathan | N/A | Counselor | Pflugerville | United States | Texas | View |
| McQueen, James | CBT Niagara | Social Worker/Therapist | St. Catharines | Canada | Ontario | View |
| McReynolds, Cormac | Kent and Medway NHS Trust | Behaviour Analyst | Ashford | United Kingdom | Kent | View |
| McSorley, Kevin | Ascent Wellness Program | Clinical Psychologist | Milwaukee | United States | Wisconsin | View |
| McWhinnie, Chad | University of Arizona College of Medicine | Child and adolescent clinical psychologist | Tucson | United States | Arizona | View |
| Meadows, G | The Sleep School | Sleep Therapist | London | United Kingdom | London | View |
| Medrado Mizael, Táhcita | The University of Edinburg | Teaching Fellow in Clinical Psychology | Edinburgh | United Kingdom | Edinburgh, City of | View |
| Meeker, Rob | Proactive Psychotherapy LLC | Staff Therapist / Clinical Social Worker | Chicago | United States | Illinois | View |
| Meerbeek, Patrice | Jellinek (alcohol and drug abuse centre) | Therapist | AMSTERDAM | Netherlands | | View |
| Meertens, Nathalie | NOBCO / EMCC | Coach/Counselor | Sittard | Netherlands | Limburg | View |
| Mei-Zahav Oren, Vered | Bar-Ilan University | Clinical Social Worker, Phd | Givat-shmuel | Israel | HaMerkaz | View |
| Meijer, Andrea | N/A | Psychologist | Nijetrijne | Netherlands | Friesland | View |
| Meijer, Fenno | NVTA and NAP and ACBSBeNe | Individual and couples therapist | Nijmegen | Netherlands | Gelderland | View |