Cecilia Fitz-Gerald, MD

Michelle Harris is a board-certified psychiatric mental health nurse practitioner (PMHNP). She earned her Master of Science in Nursing in the psychiatric mental health track at the University of Saint Joseph and her Bachelor of Science in Nursing from the University of Connecticut. Her training includes psychiatric diagnosis, medication management, cognitive behavioral therapy, and motivational interviewing. With over a decade in psychiatric mental health care and 5+ years as a PMHNP, she has worked in outpatient, private practice, telehealth, inpatient, and homecare settings, treating patients from diverse backgrounds, including neurodivergent, LGBTQ+, BIPOC, and immigrant populations. She has a particular interest in ADHD, depression, anxiety, and OCD.

Michelle values a holistic approach to mental health and believes culturally sensitive care is essential. She strives to create a supportive environment for patients of all backgrounds and sexual orientations, ensuring each person feels understood, respected, and empowered in their care.

Michelle focuses on medication management with supportive therapy as appropriate. Initial sessions involve gathering a detailed patient history and discussing individual concerns. She works collaboratively with each patient to develop a personalized treatment plan, addressing their unique needs and goals.

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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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.

Dr. Mullenix is a board-certified adult psychiatrist who strives to form strong therapeutic and collaborative environments with patients and values patient empowerment. Dr. Mullenix received his medical degree from the Chicago Medical School and then went on to complete his residency in psychiatry at Advocate Lutheran General Hospital. His interests and expertise are in helping patients struggling with depression, anxiety, including social/obsessive compulsive and generalized anxiety disorders, and ADHD. He provides psychiatric medication management along with supportive, cognitive behavioral therapy (CBT) and other modalities of therapeutic treatment. Dr. Mullenix's practice focuses primarily on medication management, or pharmacotherapy. He routinely incorporates supportive therapy into his 30-minute follow-up visits. Dr. Mullenix may occasionally recommend that a therapist be part of the care team to provide optimal outcomes. The philosophy of his practice is to actively involve patients in the decision-making process to improve adherence to treatment and build trusting relationships with all patients.

Dr. Emily Sykes is a board-certified adult psychiatrist. She received her Bachelor of Arts degree with Magna Cum Laude distinction from Carleton College, where she majored in biology. Dr. Sykes completed her Doctor of Medicine degree from the University of Toledo. She completed her psychiatry residency at the University of Cincinnati and was the outpatient chief resident physician. Dr. Sykes' specialty interests include mood disorders, anxiety disorders, post-traumatic stress disorder (PTSD), obsessive-compulsive and related disorders, Cognitive-Behavioral Therapy (CBT) and holistic wellness. She is a certified Cognitive Processing Therapy (CPT) provider for PTSD. Dr. Sykes provides compassionate, evidence-based, individualized, holistic care for patients suffering from a variety of mental health diagnoses and concerns. She incorporates supportive therapy, cognitive-behavioral therapy and solutions-focused therapy into her sessions.

Dr. Zachary Masuda earned his medical degree at Creighton University School of Medicine in Omaha and completed his Psychiatry residency at Creighton University School of Medicine in Phoenix. He went on to complete an Addiction Psychiatry fellowship at Oregon Health and Science University. During training, he was inducted into the Gold Humanism Honor Society, reflecting his commitment to compassionate care. Dr. Masuda is board-certified in general psychiatry and has experience working in outpatient, residential, and inpatient settings.

Dr. Masuda is dedicated to creating a safe, supportive, and nonjudgmental environment where patients feel heard and respected. He emphasizes open communication to establish clear treatment goals and expectations, ensuring patients are active partners in their care. His approach remains flexible, adapting as treatment evolves to best meet patient needs.

Dr. Masuda begins by gaining a thorough understanding of each patient’s history, concerns, and goals during the initial session. He then develops personalized treatment plans that align with those goals, integrating both medication management and therapeutic interventions. His balanced approach allows for individualized care tailored to support long-term recovery and overall well-being.