Cardiologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Chiropractor providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dentist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dermatologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Family Physician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
OB-GYN providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Ophthalmologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Orthopedic Surgeon providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Pediatrician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Physical Therapist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Podiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Psychiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
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.
Many residents of Sunnyvale, Santa Cruz, Monterey, and Watsonville, California, have come to Sleep Health MD for help with sleeping problems. The team of doctors at the center provide a wide array of sleep medicine services.
Dr. Daniel Katzenberg, Dr. Aaron Morse, Dr. Zachary Adams and Dr. Sarish Nakka are all highly trained in their respective specialties and respected by their peers in the area. All four physicians are board-certified and have a lot of experience treating patients.
Because each doctor at Sleep Health MD has a unique background, the center is able to offer many different services and treatments. Some of the conditions they treat include the following:
obstructive sleep apnea
insomnia and narcolepsy
restless leg syndrome
pediatric sleep problems
snoring and other sleep issues
Many of the patients who have come to Sleep Health MD have been successfully treated, and many of them recommend the center to others who have trouble sleeping.
I provide a safe environment coupled with active listening to establish a trusting rapport with my clients. I use evidence based practice to treat the identified diagnosis and meet my client's specific needs. I attended school at California State University Long Beach. I have been practicing as a nurse practitioner, in several settings, for 5 years. I have 30 years of clinical experience and was first trained in healthcare at LAC/USC level 1 trauma center allowing me to develop efficient assessment skills, effective critical thinking and a compassionate bedside manor. I encourage patients and families to participate in their treatment plan.
“I was a little hesitant about doing an online session but she was on time ,she listened to me and we are working on getting me where I need to be. I’m very happy I saw her. ”
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