Gregory Miller, DO

Background and credentials

Dr. Agarwal is a board-certified adult psychiatrist. He obtained his bachelor's degree in Biological Sciences from the University of California at Irvine and graduated cum laude with his medical degree from the American University of Antigua. Dr. Agarwal completed his psychiatry residency training at the University of Central Florida, where he was elected chief resident.

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Treatment approach

Dr. Agarwal employs a collaborative and patient-centered approach, primarily focusing on medication management in combination with supportive therapy. He is a strong advocate of psychoeducation, believing it to be an integral part of effective psychiatric care. Dr. Agarwal specializes in treating adults experiencing depression, anxiety, PTSD, and insomnia. He is also experienced in managing patients with psychiatric conditions complicated by medical comorbidities such as obesity, hypertension, chronic pain, and diabetes.

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What you can expect in a first visit

Patients visiting Dr. Agarwal for the first time can anticipate a comprehensive evaluation conducted in a collaborative and supportive environment. Dr. Agarwal prioritizes understanding each patient's individual needs and concerns, creating a personalized treatment plan that integrates medication, supportive therapy, and psychoeducation. Follow-up visits typically last about 30 minutes, allowing time to adjust treatment and reinforce therapeutic strategies.

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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. Sabrina Lefcochilos-Fogelquist earned her bachelor’s degree from Georgetown University and her medical degree from Sidney Kimmel Medical College at Thomas Jefferson University. She completed her psychiatry residency at the Icahn School of Medicine at Mount Sinai Morningside/West in New York City. She has experience in outpatient, inpatient, and emergency psychiatry, treating a broad spectrum of mental health conditions across diverse populations.

Dr. Lefcochilos-Fogelquist values compassionate, holistic care and strives to build long-term, collaborative relationships with her patients. She is particularly drawn to the outpatient setting, where she can engage with the evolving narratives of her patients’ lives. She creates a warm, supportive environment where individuals feel safe, respected, and heard.

Her process begins with a comprehensive evaluation to understand each patient’s history, concerns, and goals. Treatment plans are individualized and may include medication management and psychotherapy. She integrates supportive, cognitive behavioral, psychodynamic, and mindfulness-based techniques to meet patients' evolving needs.

Dr. Kerry O'Leary is a board-certified adult psychiatrist who joined Talkiatry after she completed her psychiatry residency. Dr. O'Leary provides patient-centered care and understands the importance of actively involving patients in their treatment journey. She believes that every patient deserves personalized care tailored to their unique needs and circumstances. She utilizes evidence-based treatments combined with a comprehensive approach to address not only the symptoms but also the underlying factors contributing to her patients' distress. Although her practice focuses on medication management, she also provides supportive therapy and may recommend more intensive therapy when indicated. Dr. O'Leary approaches each patient with empathy and understanding, fostering a supportive and nonjudgmental environment. Dr. O'Leary completed her undergraduate training at The University of Texas at Austin and pursued her medical degree at The University of Texas Medical Branch in Galveston. She also graduated with a Master's in Public Health from Columbia University in New York. She went on to complete her general adult psychiatry training at Baylor College of Medicine in Houston. Dr. O'Leary focuses on treating the adult population from ages 18+. She utilizes both pharmacological and psychotherapeutic treatment interventions and has experience in treating a variety of diagnoses including depression, anxiety, bipolar disorder, insomnia, PTSD, OCD, and psychotic disorders.

***Provider does not prescribe controlled substances*** Dr. David Eiler is a staff psychiatrist at Talkiatry. He is board certified in adult psychiatry. Before joining Talkiatry, Dr. Eiler was a staff psychiatrist at Dartmouth-Hitchcock Medical Center (DHMC), where he had an academic appointment and served as clinical director of transcranial magnetic stimulation (TMS) and intranasal esketamine services. In his practice, Dr. Eiler has focused on medication management and interventional techniques, including TMS, for the treatment of depression and other disorders. Dr. Eiler received his MD from the University of Wisconsin School of Medicine and Public Health and completed his residency at DHMC.

Mahreen Rashid, PMHNP, has over ten years of experience treating patients with a variety of psychiatric diagnoses across inpatient, intensive outpatient, and outpatient settings. While she has cared for children, adolescents, and adults, her primary focus and passion is supporting adults with their mental health needs. She earned her medical degree and completed her training with a commitment to compassionate, evidence-based care.

Mahreen takes a collaborative approach, working closely with each patient to understand their emotional needs and medication preferences. She values a team-based approach, integrating input from patients and other care providers to create a holistic treatment plan that supports overall well-being.

During initial evaluations, Mahreen gathers a thorough history, including medical background, mental health concerns, and personal goals. She reviews past medication trials, discusses previous experiences with providers, and assesses each patient’s comfort level with new treatments. Together, she and her patients develop individualized plans to support long-term mental health and wellness.

Maegan Roberts, PMHNP, earned her MSN from Indiana University School of Nursing and her BSN from the University of Evansville. She worked as a Registered Nurse in inpatient psychiatry for five years before transitioning to outpatient care as a psychiatric nurse practitioner in 2017. Maegan has experience treating patients across the lifespan, from school-aged children to older adults. She is especially attuned to the challenges of young adulthood, parenting, and navigating complex family dynamics. Committed to lifelong learning, she values the insights and perspectives her patients bring to their care.

Maegan creates a therapeutic environment grounded in dignity, empathy, and respect. She empowers patients through education about diagnoses, symptoms, and medications while promoting autonomy and informed decision-making. Her approach blends psychopharmacology with supportive therapy, skill-building, and sustainable lifestyle strategies, helping patients build insight and resilience.

In the initial appointment, Maegan takes time to understand each patient’s history, concerns, and goals. From there, she collaborates with patients to create and adapt treatment plans that align with their evolving needs, always keeping the individual’s unique context and aspirations at the center of care.