Stephanie Mattei, Psy.D.

Stephanie Mattei, Psy.D. is a licensed clinical psychologist who earned her doctoral degree from La Salle University in 2003. Dr. Mattei is Intensively trained in Dialectical Behavior Therapy (Behavioral Tech), DBT-PE  and is one of the few clinicians in the state of Pennsylvania to has earned DBT certification through the Dialectical Behavior Therapy-Linehan Board of Certification (DBT-LBC).

Dr. Mattei has co-founded the Center for Acceptance and Change in Bala Cynwyd, PA. She has a particular interest in treating women who meet criteria for BPD, engage in Non-Suicidal Self Injury (NSSI), have suicidal thoughts/experiences and who struggle with eating disorders, trauma and relationship distress.  She has been on a consistent consultation team for over 20 years, runs a variety of skills groups consults to local DBT practices to ensure DBT adherence and fidelity.

Dr. Mattei has been teaching and supervising students in the Doctoral Program at LaSalle University since 2004. She has taught courses in Abnormal Psych, Theories of Personality, Group and Family Systems and an Advanced Topics course on Dialectical Behavior Therapy (DBT).  In addition to pure academic instruction. She supervises second-, third–, and fourth-year doctoral students in their learning and application of DBT in the clinical setting at La Salle University’s Community Center for Psychological Services (LUCCPS). In addition to this, she also sits on dissertation committees and helps students wrestle with questions about regulating emotions, suicidal behaviors, eating disorders, and depression.

Lastly, Dr. Mattei also has a subset of patients that she treats who have been diagnosed with Polycystic Ovary Syndrome (PCOS). Having treated PCOS for over 20 years, she has authored chapters about the topic (Grassi: The Dietician’s Guide to PCOS) and has co-written a workbook to assist women with under-recognized medical disorder (Grassi & Mattei: PCOS Workbook: Your Complete Guide to Physical and Emotional Health).

Areas of Expertise:

• Dialectical Behavior Therapy
• Suicide and Non-suicidal Self Injury (NSSI)
• Eating Disorders
• PTSD and Trauma
• Polycystic Ovarian Syndrome (PCOS)

Education and Credentials:

• Licensed Psychologist (Pennsylvania)
• Board Certification in DBT (Linehan Board of Certification)
• D. Clinical Psychology (La Salle University)
• M.A. in Human Services Psychology (La Salle University)
• B.A. in Psychology (Rider University)
• Central High School, Philadelphia, (249)

Teaching:

• Instructor for Psy 155 –Introduction to Psychology
• Instructor for Psy 235-Abnormal Psychology
• Instructor for Psy 425- Theories of Personality
• Instructor for Psy 705- Psychotherapy II: Group and Systemic Approaches
• Instructor for Psy 788- Practicum Seminar
• Instructor for Psy 741- Dialectical Behavior Therapy: Advanced Topics
• Clinical supervisor for doctoral students treating clients with Dialectical Behavior Therapy, Schema Therapy, Personality Disorders, and emotion regulation difficulty.

Publications/Presentations:

Mattei,S (2025, March) Introduction to Dialectical Behavior Therapy: The beyond the basics: Workshop delivered to Center for Hope and Health

Mattei,S (2024, December) Introduction to Dialectical Behavior Therapy: The basics: Workshop delivered to Center for Hope and Health

Harrison, E. G., Cassidy, K., Jarjour, M., Randle, E., Weinstein, I., Peritz, S., Campbell-Grendys, M., & Mattei, S. (2024, November 14). Cultural themes influencing emotion dysregulation in diverse populations. Poster presented at ISITDBT, Philadelphia, PA.

Mattei, S.B. and Sposato, R. (2020), Skills only or comprehensive DBT: That is the question. Clin Psychol Sci Pract. doi:10.1111/cpsp.12354

Mattei, S. (2020,October). Managing Stress in 2020: AKA Survival: Workshop delivered to the Associated Alumni of Central High School of Philadelphia (AACHS)

Mattei, S. (2019, October) Using Distress Tolerance and Mindfulness skills to regulate emotions and cope with difficult situations.  Workshop presented at Year One Drexel Medical Student Wellness/Resilience Session.

Grassi, A. & Mattei S. (2019) The PCOS Workbook: Your guide to complete guide to physical and emotional health: Second Edition. Luca Publishing. Haverford PA

Hyman-Jager, S., Cunningham, A., Wenzel, A., Mattei, S., Brown, G.K., & Beck, A.T.  (2014)  Cognitive Distortions and Suicide Attempts. Cognitive Therapy and Research. Vol 38 (4) 369-374

Professional Memberships:

Pennsylvania Psychology Association

Philadelphia Behavior Therapy Association

Philadelphia Society of Clinical Psychologists

National Eating Disorders Association