Sara Mateo, MD

Dr. William Richie is an adult General and Forensic Psychiatrist. He earned his undergraduate and medical degrees from the University of Missouri Kansas City, completed his psychiatry residency at Howard University Hospital in Washington, DC, and later served as a Major in the United States Air Force. After his service, he returned to Howard as Chief of the Inpatient Psychiatric Service and completed fellowship training in Forensic Psychiatry at LSU Medical Center. Dr. Richie specializes in personality and dissociative disorders, pre-trial evaluations, and is especially interested in Men’s Mental Health.

Dr. Richie brings decades of clinical and academic experience to his practice. He believes that the foundation of effective care lies in a strong, respectful patient-psychiatrist relationship. His interpersonal and dialectical approach fosters collaboration, trust, and deeper understanding.

Dr. Richie takes time to listen carefully, ask thoughtful questions, and offer meaningful feedback. He works closely with each patient to develop a personalized treatment plan that supports long-term well-being and meaningful progress.

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Severine Dondina, PMHNP-BC, is a board-certified psychiatric nurse practitioner with licensure in Washington and Florida. She holds a Master of Science in Nursing from the University of Alabama at Birmingham and graduated summa cum laude with dual bachelor’s degrees in nursing and biomedical science. Her background spans outpatient, community, forensic, and crisis psychiatry, including leadership roles with Florida’s Assertive Community Treatment (FACT) and Multi-Disciplinary Forensic Teams.

Currently serving patients in Washington, Severine treats adults with ADHD, anxiety, depression, PTSD, and bipolar disorder. She brings a trauma-informed, strengths-based approach to care and is deeply committed to creating affirming spaces for LGBTQ+ and gender-diverse individuals. Her clinical style combines evidence-based medication management with warm, collaborative support.

Trilingual in English, French, and Spanish, Severine is known for her cultural sensitivity, clinical rigor, and authentic presence. She approaches each patient with curiosity, humility, and respect—believing healing begins with connection.

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Dr. Santos is a psychiatrist with more than 4 years of experience practicing in a variety of settings with an emphasis on psychiatric outpatient care. She is experienced in treating several psychiatric disorders including but not limited to: Bipolar and Related Disorders, Depressive Disorders, Anxiety Disorders, Trauma and Stressor Related Disorders, Obsessive-Compulsive and Related Disorders, and Substance Related and Addictive Disorders. Dr. Santos received her medical degree from the University of Queensland in Brisbane, Australia / Ochsner Clinical School in New Orleans, Louisiana. She completed her residency training at Louisiana State University in Shreveport, Louisiana. Dr. Santos tailors her approach to the individual patient. She focuses on medication management and incorporates several therapeutic techniques including supportive therapy, cognitive behavioral therapy, acceptance therapy and mindfulness.

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. Caitlin Gardiner is a board-certified psychiatrist specializing in child and adolescent psychiatry and psychotherapy. Dr. Caitlin Gardiner's practice is based on the biopsychosocial model and believes that the foundation of healing is in psychotherapy and human connection. She is known for incorporating therapy into her medication management practice. Typically she offers 30-minute follow-up visits for medication management with focused therapy based on individual needs. As a known helper, Dr. Gardiner started her career with a bachelor's degree in social work from Cazenovia College in Cazenovia, NY. After changing career paths, she received her medical degree from SUNY Upstate Medical University in Syracuse, NY. She stayed upstate to complete her general psychiatry residency, where she was chief resident at the beginning of the COVID-19 pandemic. Following this, she completed her child and adolescent psychiatry fellowship at Upstate due to the high quality of training. Dr. Gardiner has completed 3 years of advanced training in Dynamic Deconstructive Psychotherapy as well as specialized training in DBT. Dr. Gardiner is a well-rounded psychiatrist who enjoys treating youth and young adults during transitional phases of life while providing a safe and supportive environment. She believes strongly in reducing polypharmacy and providing high-quality medication management through a therapeutic and developmental lens.

Dr. Rachel Sherhart is a board-certified adult psychiatrist who has been in practice for over 4 years. She specializes in medication management with 30-minute follow-up visits. This may be accompanied by elements of supportive therapy, Acceptance and Commitment Therapy (ACT), Dialectical Behavior Therapy (DBT), and psychodynamic therapy. If more in-depth work is needed, she may refer patients to a collaborating psychotherapist. ‍Dr. Sherhart received her medical degree from Texas A&M Health Science Center and completed her psychiatry residency training at the University of Texas Southwestern in Dallas, Texas. She has served as faculty at Texas A&M University College of Medicine, providing education and supervision for psychiatry residents and medical students. ‍She has experience treating adult patients from many walks of life with a broad range of diagnoses, including depression, anxiety, bipolar disorder, ADHD, and trauma-related disorders. Dr. Sherhart has a passion for providing excellent patient care and education. Her goal is for patients to feel heard and find a safe place to discuss their concerns. She is motivated to work collaboratively with patients to find a solution that best fits their treatment goals and improves their overall quality of life.‍