Book a therapist or psychiatrist in Ontario, CA covered by United Healthcare

First Things First, you are here! I’m happy about that and excited to help you reach your next step in life. Having helped my clients for over 20 years now, I have a deep understanding of how to facilitate growth and will be tailoring our sessions to your personal goals and individual needs.

If you are looking to become a better, happier, and healthier person and would like to gain a deeper understanding and love for yourself and others, I can help you. Psychotherapy can improve the quality of your life and/or manage more serious issues such as depression, anxiety, and grief. The process focuses on comfortably connecting with you in a confidential and empathetic, therapeutic setting.

Robert Troy Vander Zwart obtained his Master's Degree at Gordon Conwell Theological Seminary and has over 25 years of experience. Prior to beginning in his private practice Troy worked in a variety of clinical settings. Troy's specialty is counseling individuals with symptoms of depression and anxiety and who have experienced trauma. He also has a passion for couples counseling, marriage and pre-marriage counseling, and family therapy.

With over three decades of hands-on clinical and nursing leadership experience, I am a Doctorally prepared and Board-Certified Psychiatric Mental Health Nurse Practitioner. My professional journey has been devoted to helping individuals overcome emotional distress, regain control of their lives, and achieve mental and physical well-being.

With certification as a Psychiatric Mental Health Nurse Practitioner and a Doctorate in Healthcare Administration, I bring a holistic, integrative perspective to mental health. My practice philosophy blends evidence-based psychiatric medicine with empathy, respect, and patient collaboration. Healing begins with understanding, and I take time to listen, educate, and partner with my patients to develop individualized, sustainable treatment plans.

Dr. Adatsi has a clear mission: to provide comprehensive care that not only alleviates symptoms but also enhances quality of life, restores confidence, and promotes resilience. His commitment to your well-being is unwavering.

Whether you’re navigating life transitions, managing chronic stress, or seeking clarity amid emotional challenges, I’m here to guide you toward balance, stability, and renewed hope.

Specialties:

• Anxiety and Panic Disorders
• Depression and Mood Disorders
• ADHD (Adult and Adolescent)
• Trauma and PTSD
• Bipolar Disorders
• Sleep Disorders

As a Nurse Practitioner, I believe healthcare should be a partnership, not a prescription. My approach combines advanced clinical skills with a deep commitment to patient advocacy, ensuring every individual has the tools and confidence to take charge of their health. I specialize in creating personalized treatment plans that honor the whole person — mind, body, and spirit. Whether I’m diagnosing, prescribing, or simply listening, my mission is to make every patient feel seen, heard, and cared for. I strive to turn sessions into moments of trust, learning, and hope."

I am board certified in Family Practice as well as Psychiatry and have been in practice for 25 year. I work with mental health issues such as depression, anxiety, sleep disorders, bipolar disorder, as well as address physical symptoms or issues that may affect mental health. I hold a Doctorate degree in education and Master Degrees in Advance Practice Nursing and education.

I am a licensed marriage and family therapist. As a culturally competent therapist, my mission is to empower individuals to harness their inner strength and create transformative change in their lives.

I am experienced, DNP , PMHNP compassionate, non-judgmental person, provide the full range of psychiatric-mental health care across the lifespan and can prescribe Medication and administer psychotherapy.

I work with adults across the full span of life, from age 18 through 103, and I truly value the different experiences that come with each stage. Whether you are navigating depression, anxiety, bipolar disorder, ADHD, or simply wanting to feel more balanced and well, I am here to support you. I believe mental health care should feel accessible and responsive, which is why I offer flexible options like same day appointments, telehealth, and even house calls. My goal is to meet you where you are and provide care that fits into your life, not the other way around.

Welcome!

Please message me for my availability!

My goal is to create safety, trust, and openness on your path to healing. I have been practicing for over 10 years and firmly believe that wellness is your investment in yourself.

Mi objetivo es generar seguridad, confianza y sinceridad en tu camino hacia la sanación. He estado ejerciendo la profesión durante más de 10 años y creo firmemente que el bienestar es una inversión en ti mismo.