Mustafa Taquee, MD

Dr. Pressley Warrick is a double board-certified psychiatrist specializing in general psychiatry and child and adolescent psychiatry. Dr. Warrick currently practices full-time, offering comprehensive psychiatric care to children, adolescents, and adults. She previously established and led a Behavioral Health Clinic integrated within a Family Medicine Practice. Prior to this role, Dr. Warrick provided dedicated psychiatric care at a private psychiatry practice for over a decade.

Dr. Warrick earned her medical degree from the Medical University of South Carolina, completed residency training at Baylor College of Medicine's Menninger Department of Psychiatry and Behavioral Sciences, and pursued additional specialization through a Child and Adolescent Psychiatry fellowship at Palmetto Health/USC School of Medicine.

Known for a collaborative and holistic treatment approach, Dr. Warrick emphasizes individualized care and evidence-based practices to support patients’ mental wellness. Her professional excellence has earned recognition as Sumter’s Best Psychiatrist for consecutive years.

Dr. Warrick’s preferred treatment modalities include medication management, psychodynamic psychotherapy, and supportive psychotherapy. She specializes in treating depression, anxiety, ADHD, autism, OCD, bipolar disorder, and PTSD. Her typical approach for new patients involves taking a detailed patient history, establishing rapport, and setting clear treatment goals in partnership with her patients.

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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Xavier Diao, MD (he/him) is a board-certified psychiatrist. He earned his undergraduate degrees in Psychology and Biological Sciences at the University of Maryland, where he also obtained his medical degree. Dr. Diao completed his psychiatry residency at the Icahn School of Medicine at Mount Sinai, received additional training in child and adolescent psychiatry at Columbia and Cornell, and finished a psychoanalytic fellowship at the New York Psychoanalytic Society & Institute. Prior to joining Talkiatry, he was an Assistant Professor of Clinical Psychiatry at the University of Pennsylvania, where he provided clinical care and teaching along the undergraduate-graduate medical education continuum.

Dr. Diao's therapeutic orientation is informed by psychodynamic, cognitive behavioral, and dialectical behavior modalities. He has expertise in the treatment of a diverse range of mental health conditions, including depression, anxiety, OCD, and PTSD. Dr. Diao uses a developmentally informed and LGBTQ-affirmative approach in his practice, with the aim of enriching meaning and alleviating suffering in the domains of work, play, and love.

Dr. Diao begins each encounter with gentle curiosity, inviting patients to share their stories without fear of judgment. Together, he crafts an individualized treatment plan with the patient that may include medication, psychotherapy, and/or referrals to subspecialty care, always in close collaboration with other members on the treatment team.

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Courtney Flynn, LCSW, earned her Bachelor of Social Work in 2015 and Master of Social Work in 2017 from Colorado State University in Fort Collins, Colorado. She has over a decade of experience practicing psychotherapy in the Northern Colorado region.

Courtney began her career in 2014, working with high-risk youth on parole in a residential treatment setting. In this role, she provided crisis intervention and therapeutic support to adolescents with complex trauma. In 2015, she served as a facilitator at a high school Wellness Center, supporting teens struggling with substance use, trauma, and mental health challenges by connecting them with individualized resources.

From 2017 to 2022, Courtney worked at Mountain Crest Behavioral Health Center in Fort Collins as a care coordinator and behavioral health therapist. There, she provided a wide range of services, including crisis intervention, individual therapy, family and couples counseling, group therapy, trauma-focused care, and discharge planning for adolescents and adults in an inpatient psychiatric setting.

In 2022, Courtney shifted her focus to clients with substance use disorders. She joined Northpoint Recovery in Loveland, Colorado, where she served as a primary therapist for both adolescents and adults in intensive outpatient and inpatient programs, offering individual and group therapy.

In 2023, Courtney began working at The Redpoint Center in Fort Collins, an intensive outpatient program specializing in mental health and substance use treatment. There, she facilitated individual and group therapy sessions, helping clients explore and address the underlying causes of their behaviors in a safe, supportive, and authentic therapeutic environment.

Courtney is skilled in a range of therapeutic approaches, including Dialectical Behavior Therapy (DBT), Cognitive Behavioral Therapy (CBT), Motivational Interviewing, recovery-oriented care, and Internal Family Systems (IFS). She has extensive experience working with individuals and families affected by trauma, and has successfully treated a variety of concerns, including mood disorders, PTSD, anxiety, depression, family conflict, personality disorders, and substance use disorders. Courtney takes a strengths-based approach with her clients, tailoring her methods to their unique needs and empowering them to create a life worth living.

Courtney's passion for this work is driven by a deep commitment to supporting her community and a genuine sense of empathy and compassion for others. Outside of her clinical work, she has been a professional dancer for over 15 years and has taught dance in her community for the past 12. In her free time, she enjoys spending time outdoors, listening to music, seeking new adventures, and being with her friends, family, and loved ones. Traveling is also one of her greatest joys when she's not working or dancing.

Courtney's approach to working with clients is rooted in meeting them where they are, respecting their autonomy, and empowering them to connect with both their past and present selves. She prioritizes building rapport and trust from the very first session, ensuring clear goals and objectives are established early on. Courtney brings a kind, compassionate, and positive attitude to each session, fostering a structured yet upbeat environment where clients feel safe to explore their thoughts and emotions freely.

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Dr. Upton Thomas is a board-certified psychiatrist who takes a warm, collaborative, and evidence-based approach to care. With a focus on treating mood disorders, anxiety, OCD, and substance use, he integrates psychopharmacology and psychotherapy to support patients in achieving meaningful change. He brings curiosity, creativity, and a deep respect for each individual’s story to his clinical work.

Patients often find Dr. Thomas easy to talk to and appreciate his calm, thoughtful demeanor. He emphasizes shared decision-making and believes that treatment works best when the patient’s values and voice are at the center. Dr. Thomas aims to create a safe space for honest dialogue and ongoing reflection as treatment evolves.

Dr. Thomas begins with a comprehensive evaluation to understand each patient’s mental health history, current concerns, and goals. He then develops an individualized treatment plan that may include medication, therapy, or both. He prefers to use the lowest effective dose of medications and often integrates psychotherapeutic strategies such as CBT, DBT, or insight-oriented work into his sessions.

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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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