You’re in good hands at Summit Estate.

Dedicated. Professional. Ethical. The Team at Summit Estate comprises over 40 caring and supportive staff members whose primary purpose is to help our clients get “better” both physically and emotionally, and to return home and to work healthy, happy and free from the substances that have negatively impacted everyone from the person seeking treatment to their family, friends and co-workers.

Please meet the Summit Estate Team:


Tyler Fitzgerald, LMFT

Clinical Director

As the Clinical Director, I feel that truly individualized treatment is a top priority.

jon heller member of treatment team

Jon Heller, RADT-1

Director of Admissions
dr lisa benya member of the treatment team at summit estate

Dr. Lisa Benya D.O.

Internal Medicine

Angela Goncalves

Director of Operations

Sergei Vidov

Chief Executive Officer
joan borsten member of california treatment team

Joan Borsten

Executive Director

Anna Ovdienko

Director of Organizational Development

Roshin Abraham, LLPC, LAADC

Lead Residential Therapist

The field of substance abuse treatment and family therapy is something I'm passionate about and brings me a great sense of gratification.

Megan Duffy, ASW

Outpatient Coordinator/Therapist Associate

“My priority is providing person-centered therapy to clients and treating the whole human being, not just the symptoms.”

David Jordan, M.S. AMFT

Therapist Associate

David has pursued professional service and education in addiction and mental health recovery for the past 10+ years.

Nadine Emami, MFT-I, RADT_I

Therapist Intern

Shelley E. McAlpine, M.A., LAADC


Jeromy Rutter

Operations Administrator

Judy Isaac

Administration Coordinator

Judy’s passion is to help others struggling with addiction and dual diagnosis.

Debbie Clarke


Debbie has been helping people overcome substance abuse problems for over a decade.

Jessica Fonseca, RADT_I

Program Technician

Annee Delaware, LPT/LVN, CHT, EAT

Group Facilitator

Inga Roizman

Admissions Coordinator

KC Sharak


KC is a Business Management professional specializing in providing day-to-day bookkeeping services.

Melissa Luna, CADC II, ICADC

Program Manager

Martha Sanchez


Sergio Guzman


Jason Giles, MD

Healthcare Practitioner

Stephen M Mohaupt, MD

Healthcare Practioner

Ma Luisa Arreguin


Angelica Chavez


Isabel Guzman


Josh Armbruster

SLE House Manager

Amanda Smith, LVN

Lead Licensed Vocational Nurse

Alma Carina Galvan, LVN

Licensed Vocational Nurse

Nikki Jimenez, LVN

Licensed Vocational Nurse

Tatayana McGovern, LVN

Licensed Vocational Nurse

Ariane Merkel, LVN

Licensed Vocational Nurse

Elizabeth Hernandez

Medical Biller & Reimbursement Specialist