Chelsea Karson, MD

Dr. De Jesus is a bilingual psychiatrist, fluent in English and Spanish. She is a double board-certified psychiatrist in Adult Psychiatry and Child & Adolescent Psychiatry. Dr. De Jesus provides medication management services in combination with supportive therapy during 30-minute follow-up visits. Dr. De Jesus received her medical degree from the Universidad Central del Caribe School of Medicine in Bayamon, Puerto Rico. She completed her Adult Psychiatry residency at Jackson Memorial Hospital in Miami, FL. Subsequently, Dr. De Jesus pursued her fellowship in Child and Adolescent Psychiatry at Thomas Jefferson University Hospital in Pennsylvania and was a Chief Resident during her last year of training. Dr. De Jesus has been providing psychiatric services in the community mental health setting for 8 years. Her clinical focus has been in treating children, adolescents, and young adults with depression, anxiety, posttraumatic stress disorder, and ADHD. Dr. De Jesus believes in the importance of establishing an individualized treatment approach to meet each individual's need while providing comprehensive care to her patients.

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.

Margaret Ngumi, MSN, APRN, FNP-C, PMHNP-BC, is a dual board-certified Psychiatric Mental Health and Family Nurse Practitioner with over 20 years of experience in healthcare. She began her career as a Family Nurse Practitioner and later pursued a post-master’s certification in psychiatry to address the growing need for accessible mental health services. Margaret has extensive experience in both inpatient and outpatient settings, treating conditions such as depression, anxiety, PTSD, mood disorders, and substance use disorders.

She takes a collaborative, patient-centered approach to care, creating a safe and supportive environment where individuals feel heard and empowered. With a strong emphasis on holistic care, Margaret considers all aspects of a patient’s well-being—including lifestyle, relationships, and overall health. Whether through medication management, therapy, or lifestyle modifications, she is committed to helping patients achieve meaningful and lasting improvements in their mental health.

Margaret begins with a comprehensive psychiatric evaluation to understand each patient’s history, concerns, and goals. She then works closely with them to develop a personalized care plan that may include medication, therapy, and evidence-based lifestyle interventions. She prioritizes open communication, patient education, and ongoing collaboration to ensure treatment remains effective and evolves with each patient’s needs. Through her compassionate and evidence-based approach, Margaret is dedicated to helping individuals find balance and improve their overall quality of life.

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Dr. Tetyana Tarnavsky is a board-certified psychiatrist trained in Adult Psychiatry. She attended Dnipropetrovsk State Medical Academy in Ukraine where she received her M.D., M.S. and Ph.D. degrees in Psychiatry. Dr. Tarnavsky completed her residency at Harvard South Shore Psychiatry Residency Training Program in MA, where she was elected chief resident. Dr. Tarnavsky has an extensive research experience in Ukraine and the USA. She had studied computer addiction for her dissertation; had multiple abstracts and presentations; published several articles in peer-reviewed psychiatric journals as well as a book entitled Computer Addiction: Formation, Diagnosis, Correction and Prophylaxis. She has helped organize international conferences with the goal of improving access to and quality of healthcare in Dnipropetrovsk, Ukraine, and providing a national model for health care reform. Dr. Tarnavsky has worked with a variety of patients with diverse backgrounds in a Community Health Center and in the Partial Hospitalization Program as well as supervised medical students, psychiatry residents, and nurse practitioners. She has been a lecturer on psychiatry at Harvard Medical School and was involved in the training of psychiatry residents in the Harvard South Shore Psychiatry Training Program. Her primary focus has been on treating adults with depression, anxiety, post traumatic stress disorder, adjustment disorder, ADHD and other disorders. Dr. Tarnavsky strives to provide quality and compassionate treatment to individuals and their families.‍

Melissa Sims, MSN, APRN, PMHNP-BC, is a board-certified psychiatric mental health nurse practitioner who is passionate about delivering high-quality, compassionate, and comprehensive mental health care. She earned her Master of Science in Nursing from the University of Alabama at Birmingham in 2022 and has since worked in both community mental health and correctional settings.

Melissa takes a collaborative approach to care, working closely with other mental health professionals, medical providers, families, and relevant support systems to ensure well-rounded treatment. She emphasizes a patient-centered, individualized approach, combining medication management with psychotherapy to meet each person’s unique needs.

Patients working with Melissa can expect a thorough evaluation, accurate diagnosis, and a personalized treatment plan tailored to their mental health goals. One of her core priorities is to empower individuals to make informed decisions about their care by providing education grounded in research, evidence-based practices, and clinical experience.

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Dr. Karina Fatova is a board certified psychiatrist who hails from New York City but has made New Orleans her home for the past ten years. She is a graduate of Albert Einstein College of Medicine in Bronx, NY, and she did her adult psychiatry residency at Tulane University in New Orleans, LA. She was proud to have her first position post-residency at the River Oaks Hospital Trauma Unit in New Orleans, LA where she treated patients with Complex PTSD and eating disorders. The Trauma Unit was one of a few of its kind nationally because it provided very specialized treatment that was affordable to many. Dr. Fatova then went on to work at the New Orleans Veterans Affairs Hospital for the last five years in its ambulatory outpatient mental health clinic. Though her passion is Complex Trauma/PTSD, she also regularly saw veteran patients who have been diagnosed with anxiety, depression, bipolar disorder, ADHD, and adjustment disorder. During her five years at the New Orleans VA, she received three special commendations from the director of the VA for feedback from her patients about her effective integrative approach to supportive psychotherapy and medication management. She believes that her rapport with her patients, and their therapeutic work together, is just as important as the medication she prescribes to heal or alleviate their symptoms. Dr Fatova employs psychodynamic therapy techniques, at times, to help those patients who would like to explore childhood experiences that may continue to impact them in their adult lives. With respect to medication management she regularly helps patients target symptoms such as sleep issues, nightmares, persistent worry, emotional dysregulation, frequent mood changes, impulsivity, and "toning down the nervous system," among others. She strongly believes that treatment decisions are best approached as a collaboration between patient and doctor. She sees young adults who are just starting their journey into adulthood, as well as adults who have been navigating life with challenges, which may include untreated, or poorly treated, mental health symptoms. Often, by the time Dr. Fatova sees a patient, they may have lost a significant amount of faith in their mental health doctors, and she is particularly attuned to helping individuals with this type of experience.