OUR APPROACH
We are a partnership of psychiatric specialists that focus on a holistic treatment approach that embraces both humanistic psychiatry and positive psychology. We believe that humanity has value and that everyone has unique strengths and meaningful backgrounds that should be recognized.
We understand the importance of chemical imbalances, but we emphasize the connection of these imbalances to one's goals, dreams, fears, past, friends and family. We appreciate these connections and the meaning behind them.
Jonathan Sy, MD, MBA
Board Certificated Psychiatrist
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Dr. Sy is currently licensed in the following states:​
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California
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Dr. Jonathan Sy, MD, MBA is a board certified adult psychiatrist licensed to offer medication management and individual therapy. Dr. Sy specializes in adult psychiatry and takes a holistic approach to treatment that uses life coaching and cognitive behavioral therapy in conjunction with medication assistance. His philosophy of care keeps in mind that all people are complex and considers a person’s strengths and relationships. Dr. Sy believes in positive psychiatry that has an emphasis on teamwork, collaboration and patient engagement.
Dr. Sy received his medical degree from Loma Linda University and completed his psychiatry residency at University of Hawaii. He has found himself naturally drawn to mental and behavioral health care and towards understanding the human experience. He believes it is important to forge a better future by developing an understanding of what the human experience means to us, how it affects us and how it changes the way we can understand ourselves and others. In his personal life, Dr. Sy loves to travel and has an appreciation for pets, having owned many non-traditional pets such as ducks, ferrets, axolotis, peacocks, puffer fish, and an eel!
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Abigail Landenberger, DO, MBA
Board Certificated Psychiatrist
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Dr. Landenberger currently is licensed in the following states:​
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California
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Dr. Abigail Landenberger, DO, is a board-certified psychiatrist who provides medication management and psychotherapy with an emphasis on emotionally attuned, whole-person care. She specializes in adult psychiatry and works with individuals navigating anxiety, depression, trauma, and major life transitions. Her approach centers on helping patients feel deeply understood while building practical tools for stability, insight, and growth.
Dr. Landenberger believes that healing is a collaborative process grounded in trust, education, and shared decision-making. Medication is viewed as one supportive tool among many, alongside therapy, reflection, and meaningful change. She is especially passionate about helping patients make sense of their emotional experiences during periods of identity shift, relationship stress, and personal transformation.
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Dr. Landenberger earned her medical degree from Lincoln Memorial University DeBusk College of Osteopathic Medicine (LMU-DCOM) and completed her psychiatry residency at the University of Nevada, Reno. Her osteopathic training instilled a strong appreciation for the connection between mind, body, and environment, shaping her humanistic and trauma-informed philosophy of care.
Outside of medicine, Dr. Landenberger values family, connection, and personal growth. She believes that psychiatric care should feel safe, respectful, and deeply personal — a place where patients can bring their full story, not just their symptoms.