Marckus Rodolfo Rivera Pineda, M.Sc. is a Fellow and Core Faculty Trainer of Albert Ellis Institute. He is a Guatemalan clinical psychologist, psychotherapist, and university lecturer. He earned his degree in Clinical Psychology, graduating Magna Cum Laude, from Universidad Rafael Landívar in Guatemala, and holds a Master’s degree in Neuropsychology from Universidad Rey Juan Carlos in Spain.
Mr. Rivera Pineda is the founder and director of Grupo Creare, a Guatemalan institution established in 2015 that provides psychological services and specialized training in cognitive-behavioral therapies. His professional activities include clinical practice, teaching, supervision, and the development of educational resources for mental health professionals. He is a founder of the Guatemalan Association of Psychotherapists (APG), serves as Guatemala’s National Coordinator for the Latin American Association for Behavior Analysis, Modification, and Cognitive Behavioral Therapy (ALAMOC), and is a board member of the Latin American Federation for Psychotherapy (FLAPSI). From 2023 to 2025, he served as President of the Ethics Tribunal of the Guatemalan College of Psychologists. Mr. Rivera Pineda is also the creator of Arena TREC, a digital platform offering interactive therapeutic exercises, clinical activities, and psychoeducational resources for mental health professionals.
Mr. Rivera Pineda is the author of several publications, including De lo Irracional a lo Racional: Ejercicios Prácticos de TREC, S.O.S. ¡Siento que muero! Ataques de Pánico con TREC, Kimo, and The S.I.E.N.T.O. Protocol: An REBT-Based Program for Communicating Adverse News. He also contributed as a co-translator of the Spanish edition of Ruth Malkinson’s Cognitive Grief Therapy: Constructing a Rational Meaning to Life Following Loss, published in 2022 as Terapia Cognitiva de Duelo: Construyendo un Significado Racional para la Vida Después de la Pérdida.
His clinical and professional interests include emotional disorders, anxiety, panic attacks, grief, REBT training and supervision, and the development of practical therapeutic resources. His work focuses on supporting professional education and the dissemination of evidence-based psychotherapy in Guatemala and Latin America.