Chief Program Officer, M.S., M.A., LMFT
About Derya
Derya Özeş is a California Licensed Marriage and Family Therapist and the Chief Program Officer at Horizon Treatment Services. Her leadership journey began 18 years ago in pharmaceuticals, where her work in cancer research led her to witness the ripple effects of unaddressed mental health needs on individuals, families, and communities. That experience moved her into behavioral health leadership. She has served as Director, Director of Operations, and Regional Director over residential programs treating eating disorders, suicidal ideation, personality disorders, substance use disorders, and trauma, and has overseen the operations, fiscal health, strategy, and growth of 70 Bay Area school, community, and county-based therapy centers.
Areas of Focus
Program leadership and operations
Oversight of residential, outpatient, and community-based behavioral health programs across multiple counties.
Trauma and complex trauma
Clinical background treating PTSD, complex trauma, sexual trauma, and active psychosis in residential and partial hospitalization settings.
Team development
Executive coaching and clinical supervision focused on helping teams reach their fullest potential.
Education & Credentials
- California Licensed Marriage and Family Therapist (LMFT)
- M.A. Clinical Psychology — Golden Gate University, San Francisco
- M.A. Organizational Psychology — Golden Gate University, San Francisco
- M.S. Genetics — Akdeniz University, Antalya
- B.S. Molecular Cell Biology and Biochemistry — UC Davis
- Executive Coaching Delivery Certification — Stagen Leadership Academy
- Group Home Administrator Certification — CA Department of Social Services
- 5150 certification — San Mateo County (2019) and Alameda County (2025)
Where Derya Works
Cronin House
Adult residential treatment for substance use and co-occurring needs.
Project Eden Adult Outpatient
Outpatient treatment for adults across Alameda County.
Everyone is welcome here
Horizon Treatment Services provides substance use and co-occurring mental health care across the Bay Area. Most services are no-cost or covered by Medi-Cal for those who qualify.
