Robynn Cavaliere, PMHNP

Dr. Joshua Riederman is a board-certified psychiatrist with a specialization in the treatment of adults aged 18 to 65. Dr. Riederman obtained his undergraduate degree in brain, cognition, and neuroscience from the University of Michigan in Ann Arbor. He subsequently attended medical school at Nova Southeastern University in Fort Lauderdale, Florida, and completed his residency training at JFK Hospital in Palm Beach, Florida.

Dr. Riederman places a strong emphasis on establishing meaningful relationships with his patients and supporting them in achieving their individual life goals through effective treatment. He actively incorporates patient preferences into all treatment plans and integrates psychotherapy with medication management. Dr. Riederman recognizes the importance of educating patients about their care and dedicates time during each appointment to address any questions or concerns they may have.

In his clinical practice, Dr. Riederman begins by facilitating an open dialogue with patients regarding their primary concerns for the appointment. During initial consultations, he conducts a comprehensive assessment, which includes gathering relevant medical, familial, and social histories that may influence the course of treatment. In subsequent appointments, Dr. Riederman engages patients by inquiring about developments that have occurred since their last visit, as well as any issues related to medications or significant life events.

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Dr. Mennella is a board-certified adult psychiatrist. Her practice focuses on medication management and supportive therapy. Treatment emphasizes patient education and autonomy. Dr. Mennella is a proponent of shared decision-making and believes this facilitates a strong therapeutic relationship, greater satisfaction with care, and improved clinical outcomes. She completed an undergraduate degree in Information Technology from Purdue University and a master's degree in information systems from DePaul University. She received her medical degree from the University of Toledo College of Medicine and then completed her psychiatry residency at Loyola University Medical Center. Areas of interest include depression, bipolar, anxiety, and PTSD.

Dr. Absar Tahir is an adult psychiatrist double-boarded in psychiatry and internal medicine who specializes in evidence-based, holistic, and individualized care. He graduated from the University of Alabama at Birmingham, where he earned both his undergraduate and medical degrees. Dr. Tahir completed sequential residency training in both internal medicine at the Mayo Clinic in Rochester, Minnesota, followed by psychiatry at Emory University in Atlanta, Georgia. Dr. Tahir integrates his knowledge of psychiatry and internal medicine to address the complex interplay between mental and physical health, ensuring a comprehensive and thoughtful approach to diagnosis and treatment. Throughout his career, he has helped patients from all walks of life, from diverse backgrounds, with a compassionate and empathetic treatment style. He strives to ensure his patients feel their voice is heard while working collaboratively towards achieving their treatment goals. As a psychiatrist, he specializes in the treatment of depression, anxiety disorders, bipolar disorder, obsessive-compulsive disorder (OCD), post-traumatic stress disorder (PTSD), and attention-deficit/hyperactivity disorder (ADHD). He is also highly experienced in treating psychiatric problems in patients with medical comorbidities.

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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Background and credentials

Dr. Sonal Harneja is a board-certified adult psychiatrist specializing in medication management and psychotherapy for anxiety and depressive disorders. She earned her undergraduate degree from Stony Brook University and her medical degree from the University at Buffalo School of Medicine and Biomedical Sciences (now called the Jacobs School of Medicine and Biomedical Sciences). She completed her adult psychiatry residency at Montefiore Medical Center/Albert Einstein College of Medicine. Dr. Harneja has held academic appointments at New York Presbyterian/Weill Cornell Medical College and Montefiore Medical Center/Albert Einstein College of Medicine, providing collaborative and client-centered psychiatric care.

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Treatment approach

Dr. Harneja specializes in medication management and supportive psychotherapy, with a strong emphasis on promoting well-being, resilience, and mindfulness. She works closely with patients to develop individualized treatment plans, ensuring that care is collaborative and patient-centered. Follow-up visits typically last 30 minutes, during which she evaluates treatment progress and adjusts care as needed. If additional therapy is beneficial, she may recommend working with a therapist as part of a comprehensive treatment approach.

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What you can expect in a first visit

During the first visit, patients can expect a thorough psychiatric evaluation, where Dr. Harneja takes time to understand their symptoms, medical history, and treatment goals. She prioritizes open communication and trust, working collaboratively to create a personalized care plan that aligns with the patient’s mental health needs. Whether through medication management, therapy, or mindfulness techniques, she aims to foster long-term well-being and emotional resilience.

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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. Jeffrey Seley is board certified in adult psychiatry. He has been in practice for over 21 years. Dr. Seley's practice focuses on medication management in conjunction with supportive therapy and psychoeducation in 20-30 minute follow-up visits. At times, Dr. Seley may recommend additional therapy and ask that you bring another therapist into your care team to provide the best outcome. Dr. Seley graduated from Cornell University with a B.A. degree in psychology. He received his medical degree from the University of South Florida and completed his residency at New York University and its affiliated hospitals, including Tisch and Lenox Hill, where he served as chief resident. He has worked for over twenty years in private practice and at a large community hospital in Pennsylvania. His extensive hospital experience kept him sharply focused on the connection between medical issues and mental health presentations. Dr. Seley brings to his patients over twenty years of experience in general adult psychiatry treating a wide variety of conditions including depression, anxiety, bipolar disorder, ADHD, addiction, and geriatric issues. His treatment philosophy stresses the importance of being responsive, compassionate, and kind. He sees his work as the enhancement of hope.