Erin Peterson, Ph.D., Co-Director
Erin is a licensed clinical psychologist, and has been in private practice in Washington, DC since 2004, where she provides individual psychotherapy to adolescents and adults. Additionally, she runs new mother support groups for Parent and Community Education (PACE) throughout the Washington, DC, metropolitan area. Since 2007, she has served as an Adjunct Faculty member for the Georgetown University Clinical Psychology Advanced Training Program, teaching a group psychotherapy seminar to pre-and post-doctoral students. Additionally, Erin has received advanced training in the assessment and treatment of perinatal mood and anxiety disorders through the Postpartum Stress Center, and infertility counseling through Covington, Hafkin & Associates. She has also received advanced group psychotherapy training through the Washington School of Psychiatry. Prior to her work as a private practitioner, Erin served as a Staff Psychologist at Georgetown University's Counseling & Psychiatric Services on the Main and Law Center campuses. There, she served as the Group Therapy Coordinator and provided individual and group psychotherapy to undergraduate and graduate students.
Erin received her Bachelor of Arts degree in Psychology from Georgetown University and her MA and Ph.D. in Clinical Psychology from Catholic University. During her doctoral training, Erin worked in a variety of settings in the Washington, DC area, including the American University Counseling Center, the Arlington County Mental Health Center, and the Psychiatric Institute of Washington's Center for Posttraumatic Stress Disorders. During her final year of doctoral training, Erin completed a predoctoral internship at the George Washington University Counseling Center. Subsequently, she held a year-long postdoctoral fellowship at Georgetown University.
Rachel Miller, Psy.D., Co-Director
Rachel is a licensed clinical psychologist in Washington DC, where she has been in private practice since 2004. In her practice, she provides individual, couples, and group psychotherapy to adults and adolescents. Additionally, she is a clinical supervisor to pre- and post-doctoral trainees. Since 2007, Rachel serves as an Adjunct Faculty member for the Georgetown University Clinical Psychology Advanced Training Program, where she taught psychodynamic theory and technique to pre- and post-doctoral students. Rachel has completed an advanced group psychotherapy training program through the Washington School of Psychiatry and is certified by the American Group Psychotherapy Association (CGP) She is currently the co-chair of the National Group Psychotherapy Institute at the Washington School of Psychiatry. She has also completed an advanced couples training program through the Institute of Contemporary Psychotherapy and Psychoanalysis. Prior to her work as a private practitioner, Rachel was a Staff Psychologist at Georgetown University's Counseling and Psychiatric Service on the Main and Law Center campuses. There, she served as Assistant Director of Training and the LGBTQ Specialist and provided individual and group psychotherapy to undergraduate and graduate students.
Rachel received her Bachelor of Science degree from the University of Michigan and her Doctorate of Psychology from George Washington University. As a part of her doctoral training, she completed a Pre-Doctoral Internship at American University and clinical externships at various mental health facilities in the Washington DC area. After receiving her doctorate, Rachel continued her training as a post-doctoral fellow at Georgetown University. From 1998 to 2000, she worked at the National Institutes of Mental Health as a clinical researcher investigating the effectiveness of treatments for bipolar and major depressive disorders.
Prentices
Ariel Beckerman, Psy.D., Associate
Ariel is excited to join Prentice to provide therapy for individuals and couples across a wide range of concerns and life stages. She primarily works with adolescents and adults who are navigating relationship challenges, life transitions, grief and loss, anxiety, or questions about identity and belonging. She has a particular interest in working with individuals facing the unique challenges that accompany periods of life transition. Ariel brings warmth, curiosity, and authenticity to her work. Her collaborative, gently direct style helps clients feel understood, supported, and fosters meaningful growth.
Ariel received her Bachelor of Arts from Indiana University Bloomington, her Master of Science in Psychological Sciences from University College London (London, U.K.), and her Doctor of Psychology from The George Washington University. She completed her predoctoral internship at The University of Virginia's Counseling and Psychological Services and has trained in community mental health, university counseling, and middle and high school settings.
Joseph Dorer, Psy.D., Associate
Joseph believes that therapy is most meaningful when people feel genuinely understood rather than judged. As a gay psychologist, he is committed to creating an affirming, inclusive space where clients from all backgrounds feel seen, heard, respected, and valued. He works with young adults and adults across the lifespan who are seeking a deeper understanding of themselves, their relationships, and the patterns that shape their emotional lives. Whether clients are navigating anxiety, depression, relationship difficulties, identity exploration, life transitions, or the lasting impact of shame and trauma, Joseph approaches therapy with warmth, curiosity, authenticity, and thoughtful collaboration. His therapeutic style is grounded in the belief that symptoms often have meaning rather than simply being problems to eliminate. Together, he and his clients explore not only what is happening in the present, but also how past experiences, relationships, and ways of relating to oneself and others continue to influence life today. His work is primarily informed by psychodynamic theory while thoughtfully integrating cognitive behavioral and narrative-based approaches to meet each client's unique needs and goals.
Joseph earned his Doctor of Psychology and Master of Psychology in Clinical Psychology from The George Washington University, as well as a Master of Arts in Mental Health and Wellness Counseling from New York University Steinhardt and a Master of Arts in General Psychology and Bachelor of Arts in Human Development and Family Studies from American Public University. He completed his predoctoral internship through the Center for Multicultural Training in Psychology at Boston Medical Center and Boston University Chobanian & Avedisian School of Medicine, where he received advanced training in integrated behavioral health, community mental health, psychotherapy, and psychological and neuropsychological assessment. In addition, Joseph is currently a Visiting Professor and Postdoctoral Fellow in the Professional Psychology Doctoral Program and a Lecturer in the Department of Psychological and Brain Sciences at The George Washington University.
Tyler Pietz, Ph.D., Associate
Tyler is excited to join the Prentice team as a psychology associate to provide psychotherapy to individuals, couples, and groups. Tyler practices as a generalist and most often works with individuals who are struggling with the stress of daily life, relationships, depression, anxiety, life adjustments, or addiction concerns. He has experience and interest in working with adult populations including college students, young professionals, and LGBTQ identifying individuals. Tyler’s collaborative approach to therapy provides a supportive environment to facilitate self-exploration and self-improvement.
Tyler received his Ph.D. in clinical psychology from Gallaudet University. He has worked in a variety of clinical settings including Gallaudet’s Counseling and Psychological Services, The Multicultural Clinical Center (Springfield, VA), Sheppard Pratt Hospital, the Psychiatric Institute of Washington DC, and the Howard University Counseling Center. He completed his predoctoral internship at University of Nebraska-Lincoln’s Counseling and Psychological Services.