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Dr. Amira Collison is a Board-Certified Adult Psychiatrist and Board-Eligible Child & Adolescent Psychiatrist who provides comprehensive psychiatric care for children, adolescents, and adults. She completed her medical degree at the Johns Hopkins University School of Medicine, followed by both her Adult Psychiatry Residency and Child & Adolescent Psychiatry Fellowship at the UCLA Semel Institute for Neuroscience and Human Behavior. Her clinical interests include neurodevelopmental disorders (ADHD and autism spectrum disorder), anxiety and obsessive-compulsive disorders, mood disorders, trauma-related disorders, and psychotic disorders. During residency, she received advanced training in the treatment of complex mood disorders through the UCLA Mood Disorders Clinic, where she developed expertise in treating treatment-resistant depression, using evidence-based medication management, Transcranial Magnetic Stimulation (TMS), and intranasal ketamine.

Dr. Collison believes that exceptional psychiatric care begins with understanding the whole person—not simply treating symptoms. She partners closely with patients and families to develop individualized, evidence-based treatment plans that may include medication management, psychotherapy, family therapy, lifestyle interventions, and TMS when appropriate. Her approach emphasizes collaboration, compassion, and creating a supportive environment where patients feel heard, understood, and empowered throughout treatment. In addition to her clinical practice, Dr. Collison maintains an academic appointment at UCLA, where she teaches and supervises medical students, psychiatry residents, and child & adolescent psychiatry fellows.

Clinical Focus:

• Medication management, psychotherapy, and family therapy for children, adolescents, and adults
• Transcranial Magnetic Stimulation (TMS)
• ADHD, autism spectrum disorder, anxiety and obsessive-compulsive disorders, mood disorders, trauma-related disorders, and psychotic disorders

Certifications:

• Board Certified in Adult Psychiatry
• Board Eligible in Child & Adolescent Psychiatry
• Certified in Transcranial Magnetic Stimulation (TMS) by the Clinical TMS Society

Licensing:

• Licensed Physician under the Medical Board of California (License #: A191511)

Training:

• Johns Hopkins University School of Medicine (M.D.)
• UCLA Semel Institute for Neuroscience and Human Behavior (Adult Psychiatry Residency)
• UCLA Semel Institute for Neuroscience and Human Behavior (Child & Adolescent Psychiatry Fellowship)

Appointments:

• Clinical Instructor, UCLA Department of Child & Adolescent Psychiatry

Awards:

• American Academy of Child & Adolescent Psychiatry Pilot Research Award for Early Career Faculty & Child & Adolescent Psychiatry Fellows (2025–2026)
• American Psychiatric Association–SAMHSA Minority Fellowship (2022–2023)
• United States Fulbright Fellow, Spain (2016–2017)

Other:

• Author of several peer-reviewed publications and presentations at national and international scientific meetings
• Provides psychiatric care to justice-involved adults through the Los Angeles County Office of Diversion and Re-entry (ODR)
• Founder & Director, UCLA Mindful Mentors, a school-based mental health literacy program now integrated into the UCLA Adult Psychiatry Residency and Child & Adolescent Psychiatry Fellowship
• Served on American Psychiatric Association Council on Children, Adolescents and Their Families
• Member, American Academy of Child & Adolescent Psychiatry
• Member, Clinical TMS Society

(*Click here for curriculum vitae)

I am practicing in Newport Beach since 1993. I completed Psychiatry Residency at King Drew Medical Center in Los Angeles in 1992 and fellowship in Forensic Psychiatry at USC Institute of Psychiatry and the Law in 1993. I have served as the Medical Director of Inpatient Psychiatry units and Partial Hospitalization Programs for over a decade. In addition I have been providing psychiatric consultations on complex, challenging patients on the medical floors and Intensive Care Units at Hoag, Fountain Valley and Orange Coast Memorial Hospital since 1994. I am also a consultant to the Emergency Rooms at these hospitals and I have extensive experience in dealing with the legal aspects of psychiatry, as well as clinical psychiatry. I enjoy reading, bike riding, working out in the gym and traveling with my family.

Dr. Barbara Huynh, DO is a board-certified psychiatrist with 15+ years of experience helping adults improve their mental health and daily functioning. She earned her Doctor of Osteopathic Medicine degree from Western University of Health Sciences (COMP) and completed her psychiatry training at Texas Tech University Health Sciences Center. She also holds a B.A. in Psychology from California State University, Los Angeles (cum laude). Dr. Huynh practices with a warm, patient-centered style that balances evidence-based medicine with genuine connection. She listens closely, explains options clearly, and builds treatment plans that fit each patient’s goals and comfort level. Her care often combines expert medication management with supportive psychotherapy, when appropriate. Her clinical interests include depression, anxiety disorders, bipolar disorder, adult ADHD, trauma/PTSD, panic disorder, personality disorders, and women’s mental health. Patients often appreciate her compassionate, judgment-free approach and her focus on practical progress—better sleep, steadier mood, improved concentration, healthier relationships, and more confidence in day-to-day life. Dr. Huynh is committed to creating a safe space where patients feel respected and supported. Telehealth visits may be available to make care more accessible and consistent.

Dr. Debbie Chang, MD is a board-certified psychiatrist with 8+ years of experience providing personalized, evidence-based mental health care. She earned her MD from Creighton University School of Medicine in 2016 and a B.S. in Biology from UCLA. She is board certified by the American Board of Psychiatry and Neurology (ABPN). Dr. Chang combines clinical excellence with genuine compassion. She listens carefully, helps patients feel comfortable discussing personal obstacles, and builds a clear treatment plan focused on practical next steps. Her research background supports an evidence-based approach and comprehensive treatment planning tailored to each patient’s needs and goals. She treats adults with anxiety disorders, depressive disorders, bipolar disorder, trauma/PTSD, ADHD/ADD, and schizophrenia. Dr. Chang’s multilingual care is an important part of her practice—she is fluent in English and Mandarin and conversational in Spanish—so patients feel heard and understood. Telehealth is available, making it easier to stay consistent with care.

Dr. Ellen A. Machikawa, MD is a board-certified psychiatrist with 20+ years of experience helping adults manage complex mental health concerns. She provides evidence-based, personalized care in a safe, judgment-free environment. Dr. Machikawa combines expert medication management with supportive psychotherapy to support meaningful, practical progress. She has extensive training in geriatric psychiatry, mood disorders, and complex psychiatric conditions. Her clinical focus includes depression, anxiety disorders, PTSD/trauma, bipolar disorder, obsessive-compulsive disorder (OCD), panic disorder, personality disorders, psychotic disorders, ADHD, and geriatric mental health. She offers flexible and responsive care, including same-day appointments, telehealth sessions, and direct phone consultations when needed. She also uses AI note-taking support so she can focus her full attention on patients during visits. Dr. Machikawa’s approach centers on listening closely, asking thoughtful questions, and building a treatment plan that fits each patient’s needs and goals.

Dr. Han “Hannah” Nguyen is a child, adolescent, and adult psychiatrist who specializes in treating depression, anxiety, attention-deficit/hyperactivity disorder (ADHD), bipolar disorder, obsessive-compulsive disorder (OCD), schizophrenia, psychosis, trauma/post-traumatic stress disorder (PTSD), substance use disorders, autism spectrum disorder, and other neurodevelopmental conditions. She provides culturally informed, patient-centered care for children, adolescents, and adults, including advanced treatments such as transcranial magnetic stimulation (TMS) and esketamine, when appropriate. Dr. Nguyen is conversational in Vietnamese and Spanish.

Dr. Gol Ara is a board certified psychiatrist who specializes in treating depression, anxiety, attention-deficit/hyperactivity disorder (ADHD), bipolar disorder, panic disorder, schizophrenia, obsessive-compulsive disorder (OCD), psychosis, trauma/post-traumatic stress disorder (PTSD), gender-related concerns, abuse, and women’s reproductive mental health. She provides culturally sensitive, mindfulness-based, and person-centered care, incorporating acceptance and commitment therapy (ACT), cognitive behavioral approaches, and holistic practices. Dr. Ara completed her fellowship training in consultation-liaison psychiatry (CLP) at University of California, Los Angeles( UCLA). CLP is a subspecialty of psychiatry that treats mental health issues in patients with complex medical conditions. She completed her psychiatry residency at the University of New Mexico and earned her psychiatry degree from Tehran University. Dr. Ara is fluent in English and Farsi.

With her advanced training in Medicine and Psychiatry, Adult Psychiatrist Hina Sidhu, MD helps countless patients manage their mental health concerns. Dr. Sidhu is currently accepting new patients at Revîv Functional Psychiatry & TMS Wellness Center in Fullerton, California.

Dr. Sidhu completed her training at USC. She completed her Internship in Family Medicine and Residency in Adult Psychiatry, both at the University of Southern California (USC) + LAC Medical Center in Los Angeles.

As a board-certified physician through the American Board of Psychiatry and Neurology, Dr. Sidhu is known for her expertise in complex mental health care. She believes that the doctor-patient relationship should be the center of medical treatment.

Dr. Sidhu follows an integrative approach to care, focusing on the concept of Functional Medicine. All treatment plans are individualized to the patient and follow the bio-psychosocial model, which focuses on all aspects of a patient’s life.

Because Dr. Sidhu spends time addressing all areas of a patient’s well-being, they get an individualized and comprehensive treatment plan. Patients of Dr. Sidhu commend her caring and compassionate bedside manner and appreciate her willingness to educate them on wellbeing and various approaches to treatment.

George Tun, MD, is an experienced interventional psychiatrist dedicated to transforming mental health care through advanced treatments like Transcranial Magnetic Stimulation (TMS). He provides compassionate and expert care to patients at Even Better Mood Clinic in Irvine, California. 

With a focus on mood disorders and Treatment-Resistant Depression (TRD), Dr. Tun's mission is to educate and provide cutting-edge care for conditions including Major Depression, Generalized Anxiety, OCD, and PTSD.

Before establishing Even Better Mood Clinic, Dr. Tun had an extensive career working in San Francisco, Los Angeles, and Newport Beach, most recently in the position of Regional Medical Director at Mindful Health Solutions. 

A leader in his field, Dr. Tun has significantly contributed to the expansion of interventional psychiatry across California. He has trained and mentored new TMS physicians and he has taught the Interventional Psychiatry course at UC Irvine's Department of Psychiatry.

Dr. Tun advocates for a holistic, multi-dimensional approach to mental health care, combining TMS with medications, psychotherapy, nutrition, exercise, and meditation. His personalized treatment plans consider each patient's unique history, genetics, and body chemistry. Committed to long-term recovery, Dr. Tun emphasizes relapse prevention strategies to help patients maintain a fulfilling life beyond treatment.

Dr. Tun holds a Bachelor's Degree in Nutritional Sciences from the University of California, Berkeley, and an M.D. from the University of Illinois at Chicago. He completed his psychiatry residency at Harbor-UCLA Medical Center in West Carson, California. He is Board-Certified by the American Board of Psychiatry and Neurology, licensed by the Medical Board of California, and a member of the Clinical TMS Society.

For expert care in interventional psychiatry and comprehensive treatment strategies, Dr. Tun is a leading choice for patients seeking innovative and personalized mental health solutions.