Christa DeFries, MD

Dr. Claudia Cao is a board-certified psychiatrist. She earned her medical degree and completed her general psychiatry residency at the University of Michigan, followed by a fellowship in psychodynamic psychotherapy through the Michigan Psychoanalytic Institute. Prior to psychiatry, Dr. Cao was a board-certified anesthesiologist and completed her anesthesia residency at UCLA and an obstetric anesthesia fellowship at Mass General Brigham.

Dr. Cao takes a multimodal approach to mental health care, integrating medication management, psychotherapy, lifestyle changes, and integrative methods. She values personal connection and believes that understanding each patient’s story is central to effective treatment. Her goal is to support patients in improving their quality of life in a collaborative and compassionate environment.

Dr. Cao spends the first several visits listening closely to understand each patient’s concerns, goals, and experiences. She then partners with patients to develop a personalized treatment plan. Ongoing visits are tailored to each individual’s needs and may evolve as treatment progresses.

Dr. Siera Kirkland is an adult general psychiatrist. She is a diplomate of the American Board of Psychiatry and Neurology. She has been practicing for 8 years. Dr. Kirkland focuses on collaborative and evidence-based care. She believes it is imperative to form a therapeutic relationship with each individual and work together as a team to formulate the best treatment plan. Her passion is to educate, empower, and support. She specializes in medication management and brief psychotherapy .Dr. Kirkland received her medical degree from Ross University School of Medicine. She completed her residency at The Cleveland Clinic Akron General and Summa HealthSystem in her hometown of Akron, OH. Upon completion of residency, she relocated to Charlotte, NC to start her career as the Lead Psychiatrist at Novant Health Psychiatric Associates- Matthews. Dr. Kirkland has experience in treating various patient populations. Her areas of focus have been perinatal and postpartum depression and anxiety. She has also worked with adults with co-occurring substance use disorders. Special interests include women's health and minority mental health disparities.‍For established patients of Dr. Kirkland, call 917-634-5311 to schedule an appointment and let the care coordinator know you are an established patient.

Karen Tonner, MSN, PMHNP-BC is an ANCC board-certified Psychiatric Mental Health Nurse Practitioner with over eight years of experience providing psychiatric care in outpatient and community mental health settings. She works with patients across the lifespan and treats a broad range of mental health conditions, including depression, anxiety disorders, attention-deficit/hyperactivity disorder (ADHD), obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD).

Karen primarily provides medication management in conjunction with supportive therapy, using evidence-based practices to help patients achieve symptom relief and improved functioning. Her approach to care is holistic, person-centered, and collaborative, emphasizing shared decision-making and individualized treatment planning. She strives to create a welcoming, approachable, and supportive environment where patients feel comfortable being themselves and actively participating in their care. She believes that understanding each patient’s unique experiences, goals, lifestyle, and strengths is essential to effective mental health treatment.

Karen earned her Bachelor of Science in Nursing from Kennesaw State University and her Master of Science in Nursing from the University of Alabama at Birmingham. She is dedicated to continuing education to remain current with psychiatric research and is committed to delivering compassionate, high-quality care that helps patients feel heard, respected, and empowered.

Languages: English and Burmese

Dr. Pe Win is a board-certified psychiatrist.  He earned his medical degree (M.B.,B.S) from Institute of Medicine (1), Rangoon, Burma.  He went to obtain master’s degree in public health (MPH, Epidemiology and Biostatistics) from New York Medical College, Valhalla, New York.  He worked as a researcher in the area of Behavioral Health associated with drug use among HIV patients and Colombian youth.  He published several papers together with principal investigators on NIMH grants.  He received his residency training in psychiatry at Westchester Medical Center, Valhalla, New York.

Dr. Win has extensive experience in working with veterans (23 years in VA health care system) in outpatient setting. He has plethora of experience in dealing with different levels of PTSD (combat-related and military sexual trauma), anxiety, bipolar disorder, depression, OCD, mood disorders as well as behavioral issues related with memory impairment (e.g. Traumatic Brain Injury and  dementia).      

Dr. Win also worked in inpatient setting for both adolescents and adults for 5 years on a part-time basis in Four Winds Hospital, Katonah, New York.

During the first visit, patients can expect comprehensive interview focusing on patient- center approach.  After attentive, compassionate interview and open communication, patients will be evaluated thoroughly of their symptoms, mental and medical heath history, social history, family history, risk assessment, patient’s goals and needs, and treatment plan will be discussed.

He will provide warm and supportive environment by active listening and giving constructive suggestions.  He will explore possible coping strategies, assess patient’s readiness to change, and provide mindfulness, behavioral modification, CBT, motivational interview as well as medication management emphasizing on personalized treatment plan.

Dr. Win is committed to ongoing follow-up visit, reviewing prior discussions, any changes in patient’s mental/medical condition, stress level, side effects of medication, psychoeducation, coping strategies, psychotherapy, and adjustment of care as needed (medication as well as behavioral therapy)

Dr. Reaghan Hicks is a double board-certified psychiatrist in General and Addiction Psychiatry. She completed her undergraduate training at The College of Charleston followed by medical school at The University of South Carolina School of Medicine. Dr. Hicks completed Residency in General Psychiatry at The University of Florida College of Medicine in Jacksonville followed by Fellowship in Addiction Psychiatry at The Medical University of South Carolina. Dr. Hicks is an experienced clinician that specializes in treating individuals with a variety of diagnoses including adjustment disorders, depression, anxiety, PTSD, bipolar disorder, ADHD, and substance use disorders.‍She has an approachable style and values building rapport with her patients. She believes it is a privilege to be a part of someone's journey towards recovery and wellness. Dr. Hicks aims to meet each patient where they are while maintaining a nonjudgemental, patient-centered, and evidenced-based treatment approach. Dr. Hicks provides supportive psychotherapy, cognitive behavioral skills, and utilizes motivational interviewing to meet the needs of her patients. She believes effective utilization of therapy skills in conjunction with medication management can help patients meet their individualized treatment goals.

Dr. Mary O'Malley is board certified in Adult Psychiatry and Sleep Medicine. She received her medical degree from Weill Cornell Medical School and PhD in Neurobiology from The Rockefeller University. She completed her Psychiatry residency and Sleep Medicine Fellowship training at the New York University Medical Center. In her psychiatric practice, Dr. O'Malley uses an integrative approach to health, combining evidence-based concepts in neurobiology with psychological, social and spiritual/existential worldviews to understand and treat every patient. Her primary practice is medication management. She also integrates elements of psychotherapy into her work, typically within 30-minute follow-up visits. In addition to medication and psychotherapy, she incorporates wellness tools into visits, such as mindfulness exercises and sleep management strategies. If she believes that additional psychotherapy is needed, she will recommend that you add a therapist to your care team. Dr. O'Malley has extensive experience working with people from many stages of life, with diverse world views and cultural backgrounds. She has always had an inclusive practice and welcomes people who identify as LBGTQIA+. As part of her own life path she became an Interfaith Minister and enjoys including spirituality and the supportive role it can play in healing for her patients. Her primary focus is working with adults with mood and anxiety disorders, trauma symptoms, ADHD, and problems with sleep. She enjoys working with people facing life transitions, especially older adults and women who are struggling with mental health challenges related to pregnancy and post-partum health. Prior to joining Talkiatry, Dr. O'Malley was working at Hartford Healthcare with adults in intensive outpatient programs and at Hackensack Meridian Health outpatient clinics. She was the medical director of the Consultation Liaison Service at Berkshire Medical Center in Pittsfield, Massachusetts, and an assistant professor at UMass Medical School. She has published and presented widely on topics related to Wellness in Psychiatry, Ethics and Sleep Medicine. She is an advocate for finding your voice in medical decision-making and enjoys using sound healing for relaxation and stress management.