Clearview Outpatient –
Los Angeles

Director of Clinical Services

Gillian Bieler, LCSW

Gillian is a Licensed Clinical Social Worker, Certified Sex Addiction Therapist, and Mindfulness-Based Addiction and Trauma Therapist. She has worked in the field of mental health and addiction for over 10 years, beginning her career at UCLA’s Resnik Neuropsychiatric Institute. She earned a Bachelor’s Degree in Family and Child studies with an emphasis on human development and behavior from Northern Illinois University, and Master of Social Work degree from the University of Southern California and has been a licensed clinician since 2017.

Gillian brings a broad range of experience to Clearview’s Outpatient Program having formerly work in hospital settings, outpatient settings and most recently as a residential clinical director. She understands the flow, the process, and the necessity of navigating each level of care smoothly and with clinical appropriateness.

Gillian is a Chicago native who loves traveling the world, going to see live music, and watching true crime documentaries.

Program Director

Sean Doster, CADC, SUDCC

Primary Therapist

Stephanie Gianakopoulos, MA, APCC

Stephanie is an Associate Professional Clinical Counselor. Stephanie graduated with a Bachelor’s degree in Psychology from Michigan State University, while double minoring in Sociology and Human Behavior. Stephanie continued her education at The Chicago School of Professional Psychology, receiving a Master’s degree in Clinical Mental Health Counseling.

Stephanie has experience working with diverse populations in various treatment settings. Stephanie began fieldwork as a Behavioral Aide in a residential setting, working with adults with Traumatic Brain Injuries and other mental health diagnoses. She then became a Registered Behavioral Technician, working as an Applied Behavioral Analysis Therapist with young adolescents and teens on the Autism Spectrum.

Stephanie started her counseling journey at Gateway Foundation, a non-profit Drug and Alcohol Rehabilitation and Treatment Center. Stephanie worked closely with a wide range of adult clients, conducting both individual therapy and group therapy in an Intensive Outpatient setting.

Stephanie utilizes therapeutic approaches such as Dialectical Behavioral Therapy (DBT), Cognitive Behavioral Therapy (CBT) and Motivational Interviewing (MI). Stephanie believes in evidence-based psychotherapy, focusing on thoughts, behaviors and feelings.

Stephanie is passionate about mental health and finds joy in helping others. She enjoys building human connections in both her career and personal life. Stephanie is an ally to all and proudly demonstrates empathy and inclusivity

Primary Therapist

Jason Sleisenger, APCC

Jason Sleisenger graduated with a Bachelor of Arts from Case Western Reserve University and received his Master of Arts Degree in Clinical Mental Health Counseling from Northwestern University. He comes to Clearview with experience working in community mental health clinics at the San Fernando Valley Counseling Center and Valley Community Counseling Clinic, along with experience working with social services agencies such as Jewish Family Services of Los Angeles and integrated mental health training programs with California State University Northridge. Most recently, Jason gained experience working within the Collaborative Care Model (CoCM) with Concert Health Medical Group in association with Dignity Health Hospitals, where he delivered psychotherapy and crisis intervention services to clients throughout California.

Jason possesses a strong psychodynamic and person-centered therapeutic style, along with the integration of Solution-Focused Therapy, Cognitive Behavioral Therapy, and Dialectical Behavioral Therapy. Fundamentally, he believes his work is to be a liaison to help people achieve lasting improvements and make healthy adaptations in their lives.

He is an avid lover of the arts and culture, and in his free time enjoys exploring neighborhoods, hiking, surfing, and checking out independent coffee shops.

Primary Therapist

Katie Pfannkuche, AMFT

Katie graduated with a Bachelor’s degree in Psychology from California Polytechnic University, San Luis Obispo while minoring in Child Development. While working towards her undergraduate degree, Katie interned at a local crisis hotline where she found her passion for helping others. After graduating, Katie began working as a recovery coach and mental health worker at Reasons Eating Disorder Center and Monte Nido’s Clementine facility. Here, she learned from amazing clinicians and eventually continued her education at Pepperdine University, Graduate School of Education and Psychology receiving a Master’s degree in Clinical Mental Health Counseling.

Katie began her clinical work at Exodus Recovery in their high acuity locked inpatient unit. From there, she began as a primary therapist at Destinations for Teens where she worked with adolescent clients in a residential setting. Next, Katie moved to Ascend Healthcare and learned to utilize ecotherapy while working with neurodivergent adolescents in a residential setting. Her time at Ascend taught her to be creative with her approach and utilize various modalities to address clients’ needs.  Most recently, Katie was a primary therapist at Shoreline Eating Disorders, where she worked at residential and outpatient clinics with adults and adolescents.

Katie strives to seamlessly utilize a variety of therapeutic approaches such as Dialectical Behavioral Therapy (DBT), Cognitive Behavioral Therapy (CBT), Narrative Therapy, and others to find what works best with each client. Katie has completed level 1 training in Radically Open- Dialectical Behavioral Therapy (RO-DBT) and plans to continue to level 2 as soon as possible. Katie loves to learn and intends to continue her education in as many modalities as possible to best serve and support each client.

Associate Marriage and Family Therapist

Krissiane Takakura 

Case Manager

Chloe Director 

Office Coordinator

Aileen Roman

Aileen graduated from California State University Channel Islands with a degree in Psychology and a minor in Chicano Studies. Her goal is to go back to school for a master’s degree in counseling and eventually work as a school counselor. Previously, she worked in a residential facility for teens where she facilitated different groups (self-esteem, self-identity) with an emphasis in DBT. During her free time, she likes to walk, paint, hang out with friends/family, and travel.