Lorangelly Rivera, MD

Glenn is a Board-Certified Psychiatric Mental Health Nurse Practitioner with nearly 30 years of experience in health care, dedicated to addressing the mental health needs of his community. With a background in both inpatient and outpatient settings, he is committed to helping individuals become the best versions of themselves—no matter where they are in their journey at the time of their first appointment.

Outside of work, Glenn enjoys spending time with his family, biking, and being outdoors.

He takes a patient-centered approach and emphasizes that he, too, is human. Everyone faces challenges at different times and in different ways. Glenn adopts a holistic perspective, recognizing that effective treatment involves understanding how life challenges impact a person as a whole. He is dedicated to providing compassionate, empathetic, and practical care to all his patients.

Glenn engages with patients in a way that makes it easy and natural for them to share their stories. From there, he promotes a shared decision-making approach to develop the most effective treatment plan. His areas of expertise include psychopharmacology, as well as Cognitive Behavioral, Supportive, and Psychodynamic therapies.

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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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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. Julie Rodriguez is an ABPN boarded adult psychiatrist with over 15 years of clinical experience. Dr. Rodriguez's practice focuses on medication management, which is offered in conjunction with supportive therapy. Dr. Rodriguez obtained her medical degree from the Universidad Cat�lica Madre y Maestra Dominican Republic. She then completed her residency in adult psychiatry at the University of Florida, in Gainesville. After completing training, Dr. Rodriguez became a Clinical Assistant Professor for the University of Florida Department of Psychiatry. In this role she served students at UF Student Mental Health at the Counseling and Wellness Center. She also provided treatment to adults in inpatient services and other settings. While doctor Dr. Rodriguez treats a variety of age ranges and diagnoses, she is most passionate about college student mental health with a clinical expertise in the area of mood and anxiety disorders.

Dr. Danielle Jackson is a board certified Adult Psychiatrist by the American Board of Psychiatry and Neurology. She is a graduate of Yale University's Psychiatry Residency and Howard University College of Medicine. Dr. Jackson's practice focuses on a combination of psychopharmacology (medication) and psychotherapy techniques including supportive therapy, motivational interviewing and cognitive behavioral therapy. She approaches care from an individualized, patient-centered, collaborative perspective. She often integrates evidence-based lifestyle recommendations in areas such as nutrition, sleep hygiene, exercise, and stress management tools in treatment to help patients achieve their wellness goals. Her interests include adjustment disorder, mood disorders, anxiety disorders, ADHD and trauma-related disorders. In addition, she enjoys helping patients navigate the challenges that can accompany changes in life (careers, parenthood, relationships, chronic illness). Prior to joining Talkiatry, Dr. Jackson served as medical director for substance use and co-occurring disorders at Sunset Terrace Family Health Centers at NYU Langone. She has experience caring for a diverse patient population including those with perinatal mood disorders (postpartum anxiety/depression), substance use disorders and those from minoritized and marginalized communities.

Dr. Michael Kim, DO, is an accomplished attending psychiatrist dedicated to providing comprehensive mental health care. He earned his medical degree from Liberty University College of Osteopathic Medicine and completed his residency at HCA's The Medical Center of Aurora North. With a diverse clinical background, Dr. Kim has honed his expertise across various settings including inpatient, outpatient, PHP/IOP, and specialized areas such as geriatrics, eating disorders, addiction, and child and adolescent psychiatry. Dr. Kim is proficient in innovative treatments like Electroconvulsive Therapy (ECT) and Transcranial Magnetic Stimulation (TMS). He is passionate about employing supportive and psychodynamic therapy approaches, tailoring treatment plans to meet each patient's unique needs. Embracing a holistic approach to psychiatry, Dr. Kim integrates medication management with a focus on nutrition, diet, and lifestyle factors to foster overall well-being. Dr. Kim is committed to delivering high-quality, personalized care to his patients. Outside of his professional commitments, he is an advocate for personal health and wellness. He enjoys enhancing his fitness and nutrition, engaging with enlightening podcasts, and exploring the great outdoors. Dr. Kim's holistic approach to psychiatry reflects his belief in treating the whole person, ensuring optimal mental and physical health for each individual he serves.