Marge Sierra
Consultant
Dosquebradas,
Colombia
Highest Degree Held: Ph.D.
Types of Clients: Adults, Couples, Not listed
Languages spoken: English, Español
ACT/CBS Background and Training: Marge A. Sierra, PhD, is a clinical psychologist and researcher specializing Acceptance and Commitment Therapy (ACT). Her expertise centers on the design and empirical validation of digital mental health interventions, specifically focusing on transdiagnostic processes such as Repetitive Negative Thinking (RNT) and psychological inflexibility. With a PhD and MSc from the Universidad Católica de Colombia, her research program aligns with a process-based, idiographic framework, utilizing advanced statistical modeling (SEM) to identify predictors of mental health outcomes. Dr. Sierra is a pioneer in integrating AI-enhanced tools (synthetic audio and visual narratives) to increase the scalability and fidelity of online ACT protocols. As a scholar-practitioner from the Global South, she is deeply committed to social justice, focusing her clinical and research efforts on gender-affirming care and the de-pathologization of trans and non-binary identities. She has presented her work at several ACBS World Conferences and has a robust record of peer-reviewed publications in journals such as the Journal of Contextual Behavioral Science.
ACT/CBS Experience: 10 years
Additional Information: As a trans woman and researcher from the Global South, she is an active advocate for Diversity, Equity, and Inclusion (DEI), focusing on developing culturally coherent and gender-affirming clinical protocols. Beyond her academic work, she has extensive experience as a Clinical Supervisor for interns at the GAAT Foundation and is bilingual in Spanish and English (C1 level), facilitating cross-cultural collaboration and the global dissemination of Contextual Behavioral Science.