Sumbal Akhter, DO

Dr. Stephen Geisler is a board-certified adult psychiatrist and has been practicing for over 37 years. His practice focuses on medication management, and typically offers this in conjunction with supportive therapy in 30-minute follow-up visits. If Dr. Geisler feels you would benefit from working with a therapist in conjunction with medication management, he welcomes collaboration with your therapist to make for the best outcome. Dr. Geisler is a graduate of the New York University School of Medicine. He completed a fellowship in Psychoanalytic Psychotherapy at the Zucker Hillside Hospital of Northwell Health after finishing his residency training there. He is currently an Assistant Clinical Professor at the Donald and Barbara Zucker School of Medicine at Hofstra/Northwell. Over the years Dr. Geisler has received a number of awards including NAMI Exemplary Psychiatrist Award, The APA Irma Bland Certificate of Excellence in Teaching Residents, the Zucker Hillside Hospital Department of Psychiatry Recognition Award for Education, and twice received the Outstanding Teacher of the Year Award from the graduating residents' class. Dr. Geisler is a member of the American Psychiatric Association, the Nassau Suffolk District Branch of the APA and the American Society of Clinical Psychopharmacology. Through the years, Dr. Geisler has participated in many clinical research projects, has been the co-author of many papers, and has made many presentations. Dr. Geisler specializes in psychopharmacology, especially tailoring individualized treatment to serve the needs of patients with a variety of conditions. He has a lot of experience in treating patients with depression, bipolar disorder, anxiety disorders, ADHD, and OCD.

Dr. Amada holds the position of staff psychiatrist at Talkiatry. She was born and raised in Queens, NY. She completed her undergraduate education at New York University, followed by medical school at SUNY Downstate College of Medicine in Brooklyn, NY. She went on to complete her psychiatry residency at Stony Brook University Hospital, where she received an award for academic achievement. Dr. Amada believes in a holistic approach to mental health that addresses lifestyle factors alongside medication management. She values the importance of both therapy and medication in treating mental illness.

Dr. Amada takes a collaborative approach to care and strives to involve her patients in every step of the treatment process. She believes in creating a safe, supportive, and nonjudgmental space where patients can openly discuss their concerns. While her focus is on medication management, she often recommends incorporating additional therapy into the treatment plan and may ask that patients work with a therapist to help achieve the best outcomes.

Dr. Amada works closely with her patients to develop personalized treatment plans. She believes in open communication, shared decision-making, and taking into account the whole person when addressing mental health concerns. Her goal is to ensure that patients feel heard, supported, and actively engaged in their care.

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Background and credentials

Dr. Vansickle is a board-certified adult psychiatrist with over 25 years of clinical experience. She earned her medical degree from the University of Texas Health Sciences Center San Antonio and completed her internship at UAB. She then completed her psychiatry residency at the University of Louisville Hospital, where she served as chief resident and received a national award in community psychiatry. Throughout her career, she has worked in both inpatient and outpatient settings as a staff psychiatrist, primarily in Texas and Alabama.

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Treatment approach

Dr. Vansickle places a strong emphasis on establishing trust and building therapeutic relationships to help patients achieve their goals. Her practice focuses on medication management, often combined with supportive or emotionally focused therapy during 30-minute follow-up visits. If she believes additional therapy would be beneficial, she may recommend that patients work with a therapist as part of their care team. She has extensive experience treating patients in various settings, including community mental health centers, VAMC-affiliated clinics, and hospital-based psychiatric units. She also has expertise in psychiatric consultations for medically ill patients, as well as guardianship and competency evaluations.

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What you can expect in a first visit

Patients can expect a thorough initial evaluation, where Dr. Vansickle takes the time to understand their symptoms, history, and treatment goals. She provides a structured yet compassionate approach to care, ensuring that each patient feels heard and supported. Follow-up visits typically last 30 minutes, during which she monitors progress and adjusts treatment as necessary. If additional therapy is needed, she collaborates with therapists to ensure comprehensive care tailored to each patient’s needs.

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Why Talkiatry?

We’re a virtual mental health practice that makes it easy to find great care. We combine quality and convenience to help you thrive—faster. Our providers, like this one, are highly trained experts who specialize in medication management and collaborate with you on a treatment plan that fits your needs and comfort level.

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Dr. Rajesh Gaddam is a Board Certified Psychiatrist who provides compassionate and empathic care. Prior to his formal training, he worked in clinical psychiatric research at Northwell, gaining experience in evidence-based medicine. He completed his adult psychiatry residency at Bergen New Bridge Medical Center, followed by Child & Adolescent Psychiatry Fellowship at The University of Chicago, where he served as Chief Fellow. Dr. Gaddam treats children, adolescents, and adults for a range of conditions including anxiety, depression, bipolar disorder, trauma, OCD, ADHD, and substance use disorders. Dr. Gaddam emphasizes a collaborative and comprehensive approach to understand a person's life, their circumstances, and what has contributed to their symptoms. He recommends including a family member or close friend in at least one session to get a sense of challenges from a different perspective. Besides using elements of supportive and psychodynamic psychotherapy, Dr. Gaddam will refer and work with your psychotherapist to foster self-reflection and growth. He also greatly values a holistic approach to treatment, emphasizing the importance of nutrition, physical activity, sleep hygiene, mindfulness, and a support system to well-being. He wishes to provide a safe space to promote healing and wellness, so individuals can prosper in their lives.

Dr. Ayanna Swinton Jamison is a board-certified psychiatrist with over 18 years of experience in general, as well as child and adolescent psychiatry. She has extensive experience in counseling, and medication management. Dr. Jamison is committed to educating her patients about their illness and providing personalized care for each patient. Dr. Jamison received her undergraduate degree from Jackson State University. She graduated from Saint Louis University Medical School and completed her residency training in general psychiatry and child and adolescent psychiatry at the University of South Carolina. Dr. Jamison is a proud mom of four who enjoys spending time with her family, and attending her kids' sports events.

Rebecca Kostopoulos, PMHNP, is a board-certified psychiatric nurse practitioner committed to helping individuals facing mental health challenges lead full and balanced lives.

Her practice primarily focuses on medication management, often combined with supportive or emotionally focused therapy during 30-minute follow-up visits. When appropriate, Rebecca may recommend involving an additional therapist to ensure the most effective and comprehensive care.

She earned her Master of Science in Nursing with a specialization in psychiatry from Columbia University and her Bachelor of Science in Nursing from Boston College. Her training includes psychiatric diagnosis, medication management, and both psychodynamic and cognitive-behavioral therapies.

With over a decade of experience, Rebecca has evaluated and treated adults in a variety of clinical settings. Her previous roles include working at Elmhurst Hospital’s Comprehensive Psychiatric Emergency Program, Gracie Square Hospital’s inpatient unit, as well as in community health centers and skilled nursing facilities.

As a nurse practitioner, Rebecca believes that mental health is just as vital as physical health. She values the therapeutic relationship and approaches treatment with empathy and collaboration, ensuring that each patient receives personalized and compassionate care.

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