Amy Mattern, DO

Background and credentials    

Dr. Catherine Cashman is triple board-certified by the American Board of  Psychiatry and Neurology in Adult Psychiatry, Child & Adolescent  Psychiatry, and Forensic Psychiatry. She holds two Bachelor’s degrees: one in  Finance from New York University, and another in Biology from the University  of New Orleans. She earned her medical degree from Nova Southeastern  University and completed an Adult Psychiatry residency at LSU Health Sciences  Center in New Orleans. Dr. Cashman subsequently completed two fellowships:  the first in Child & Adolescent Psychiatry at LSU New Orleans, along with  a certification in Infant Mental Health (working with children ages 0–6 years  and their caregivers); the second fellowship was in Forensic Psychiatry at  the University of Rochester and the Rochester Regional Forensic Unit.    

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Treatment approach    

Dr. Cashman brings an extensive and specialized skillset to psychiatry,  informed by her triple board-certifications. Her treatment approach  integrates clinical expertise from adult, child and adolescent, and forensic  psychiatry, emphasizing accurate diagnosis, risk assessment, and  evidence-based care. With specialized expertise in forensic psychiatry and  competency assessments, she employs rigorous evaluation methods to accurately  inform treatment planning and risk management, particularly in complex or  legally-involved cases.    

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What you can expect in a first visit    

Patients visiting Dr. Cashman for the first time can expect a detailed and  comprehensive psychiatric evaluation. Given her forensic and clinical  experience, initial assessments are thorough, focusing on clear diagnostic  understanding, individualized risk assessment, and appropriate treatment  planning. Patients can anticipate a collaborative, professional, and  structured environment aimed at clarifying diagnoses and addressing their  unique mental health needs effectively.    

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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.

Dr. Qureshi is a Board-Certified General Psychiatrist. She was born and raised in Hyderabad, India. She underwent her medical training at Mamata Medical College, India and completed residency at Maimonides Medical Center, Brooklyn, NY. Dr. Qureshi has gained extensive training in psychiatric inpatient, outpatient, and emergency settings and has worked with diverse populations. She has practiced Telepsychiatry since her graduation, including working at community mental health centers serving the serious mentally ill in underserved areas. Dr. Qureshi's practice includes management of psychiatric disorders in adults including Depression, Anxiety, Bipolar disorder, PTSD, OCD, and others. She is interested in treating issues related to women's health as well. Dr. Qureshi has an empathetic and culturally sensitive approach that is patient-centered and focused on building a strong therapeutic alliance. She believes in collaborating with other providers involved in the patient's care. Her approach involves medication management in tandem with therapy techniques like CBT, Supportive therapy, IPT, and motivation therapy.

Dr. Kristofer Joondeph-Breidbart is a board certified adult psychiatrist. He earned his undergraduate degree and Master's in Teaching from Boston University, followed by his medical degree from the University of Massachusetts Medical School. Dr. Joondeph-Breidbart completed his residency in general adult psychiatry at Cambridge Health Alliance, a Harvard teaching hospital. Currently, Dr. Joondeph-Breidbart serves as a staff psychiatrist at Harvard University Health Services, where he works with both undergraduate and graduate students. He has developed significant expertise in working with LGBTQ individuals through his involvement with the Gender and Sexuality Clinic at Cambridge Health Alliance and the LGBTQ Interdisciplinary Team at Harvard University Health Services. While he has extensive expertise in treating college-aged young adults, his practice also includes a broad range of patients, with a particular specialization in Obsessive-Compulsive Disorder (OCD). He is trained in Exposure and Response Prevention Therapy, a highly effective treatment for OCD. Dr. Joondeph-Breidbart takes a holistic approach to mental health care, integrating therapy into his sessions and collaborating with patients to develop individualized medication regimens that best meet their needs. His gentle and understanding approach helps create a supportive environment for his patients, fostering their mental and emotional well-being.

Dr. Sahadevan took an adventurous path to Talkiatry. After perhaps thinking a little too hard about Intro to Philosophy in college - "the unexamined life is not worth living” - he first used his chemistry degree to work in pharmaceutical research. He changed course, working in computer network engineering, before deciding to find a more meaningful path. He worked as an EMT, then earned a Master's in Physiology before finally landing in medical school at Ohio State. Finding a surprising interest in psychiatry, he stayed at Ohio State for residency, and then a fellowship in forensic psychiatry. He is board-certified in both Psychiatry and Forensic Psychiatry. He previously worked as a forensic psychiatrist and evaluator at Ohio's maximum-security state psychiatric facility, as an attending psychiatrist running an inpatient unit for violent or dangerous patients, performing court-ordered evaluations, writing reports, and testifying when necessary. Dr. Sahadevan has also worked as a consultation-liaison psychiatrist, performing psychiatric consults at several general hospitals in Central Ohio's largest hospital system. He found great enjoyment in teaching successive generations of residents and medical students, serving as an adjunct faculty member at Ohio State, Ohio University, Wright State, and OhioHealth Riverside Methodist Hospital. He is excited for the next chapter of his journey, exploring another area of psychiatry at Talkiatry!

Dr. Nieves-Alvarado is a board-certified psychiatrist who completed medical training at Duke University Psychiatry Program. Originally from Puerto Rico, she is fluent in both English and Spanish, which allows her to connect deeply with a diverse patient population. Her practice combines medication management with insight-oriented therapy during every visit, promoting a comprehensive approach to mental health care. She advocates for her patients to engage in therapy alongside medication management, as she believes this integrated approach leads to better outcomes and sustained improvement. Dr. Nieves-Alvarado's practice is rooted in a collaborative, team-based approach, working closely with her patients to achieve long-term mental wellness. Dr. Nieves-Alvarado earned her medical degree from the Universidad Central del Caribe School of Medicine in Bayamon, PR. Afterward, she moved to North Carolina, where she completed her residency at Duke University Hospital. During her training, she was nominated for a fellowship in psychodynamic practice by the Psychoanalytic Center of the Carolinas, showcasing her expertise in this area. She is also a dedicated advocate against childhood sexual trauma. Her diverse training includes significant experience in jail and forensic psychiatry, as well as the treatment of military veterans under the Veterans Affairs health care system. She has experience in medically assisted treatments (MAT) for substance use disorders, Electroconvulsive therapy (ECT), and family therapy, enabling her to care for patients with complex needs. Dr. Nieves-Alvarado treats patients across a wide age range, from young adults to the elderly. Passionate about improving access to mental health care, she joined Talkiatry to help patients facing time or transportation challenges receive the care they need. In addition to her clinical practice, Dr. Nieves-Alvarado remains involved with her alma mater's Behavioral Health Department, contributing to academic education and maintaining a connection with the next generation of medical professionals. She continues to seek ongoing improvement in her field, remaining engaged with medical associations including North Carolina Psychiatric Association, American Psychiatric Association, and Alpha Omega Alpha national medical honor society. Dr. Nieves-Alvarado is committed to working hand-in-hand with her patients to achieve mental wellness.

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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