Joshua Weasen, MD

Dr. Kat Atadjanova is a board-certified psychiatrist dedicated to providing holistic and compassionate care for individuals navigating mental health challenges. She earned her MD from Tulane University School of Medicine and completed a combined residency in Internal Medicine and Psychiatry at Tulane. With experience in both fields, she is especially comfortable caring for patients with medical comorbidities and takes an integrative approach to treatment.

Dr. Atadjanova values collaboration and believes that treatment works best when patients are active participants in their own care. She is committed to creating a safe, supportive environment where patients feel heard and respected. Her approach combines evidence-based medication management with psychotherapy and lifestyle guidance, tailoring each treatment plan to the unique needs and goals of the individual.

In her work, Dr. Atadjanova begins by taking time to understand a patient’s history, strengths, and challenges. From there, she develops a personalized plan that may include medication, therapy, or supportive interventions. She emphasizes shared decision-making, patient education, and holistic strategies—such as nutrition, exercise, and sleep hygiene—to help patients achieve sustainable improvements in their mental health and overall well-being.

Dr Mark Giordano is a board-certified psychiatrist with over ten years of experience in adult psychiatry, addiction medication, pregnancy and post-partum care, complex medical consultation, and military health. Dr G practices psychodynamic psychotherapy as well as evidenced based medication management. Dr G has extensive experience working with culturally diverse populations, and is an Army veteran who deployed to Korea and Afghanistan.

Patients often describe Dr G as caring, providing clear explanations, and responsive to concerns.   Dr G highly values his patients trusting him to listen and respect them, as well as in his clinicial skills.  He works hard at helping his patients understand his approach to treatment, and what is happening along the way and why. He may be the medical expert, but he and his patients are partners working together in the process of achieving better health and functionality for them so they can live their best lives.

Dr G starts by explaining his overall approach to medication management and his goal of helping his patients live a better life free of disability. He conducts a detailed evaluation of your concerns, your experiences, and your priorities in treatment.  Dr G develops a unique treatment plan based on your unique needs. He emphasizes positive developments over the course of your work together and makes sure you always have a chance to discuss any questions or concerns you want him to know and answer.

Dr. Macdonnell is a double-boarded psychiatrist with over 25 years of experience in adult psychiatry and geriatric psychiatry. Dr. Macdonnell focuses on treating individuals with medication management. Supportive and interpersonal therapy is incorporated as needed. When additional therapy or longer sessions are necessary to enhance the individual's treatment, she invites a therapist to become a member of your care team. Dr. Macdonnell attended undergraduate school at Manhattan School of Music earning a bachelor's and master's degree in violin performance and musicology. She then attended the City University of New York � Hunter College campus majoring in premedical sciences. Dr. Macdonnell attended Albert Einstein College of Medicine in the Bronx, New York, earning a degree in MD. She completed an internship in internal medicine before entering psychiatry residency at New York-Presbyterian Hospital � Westchester Division. After completing her residency, she stayed for an additional year, completing a fellowship in geriatric psychiatry. She was promoted to Attending Psychiatrist and Unit Chief of the Geriatric Partial Hospital Program. After two years in academic psychiatry, she entered private practice in New York and Connecticut for 8 years. She then served 2 years in the National Health Service providing outpatient care to an underserved area in central Florida. Moving to Georgia, she has worked in private practice and academic psychiatry at Mercer University College of Medicine before moving on to Veterans' care at Atlanta VA and Carl Vinson VA Medical Center. While Dr. Macdonnell has a wide range of experience, she focuses on general adult psychiatry.

Dr. S. Taylor Williams is a psychiatrist with Talkiatry. She is board-certified in psychiatry and has been practicing over 14 years. Dr. Williams received her MD from the University of Alabama School of Medicine at UAB. She completed her psychiatry residency at the University of Tennessee Health Science Center. Prior to joining Talkiatry, she held an academic appointment at UTHSC as Assistant Professor of Psychiatry and was the Clinical Director of the Memphis Mental Health Institute. She specializes in the treatment of young adults and LGBTQ patients. Her practice focuses on medication management.‍

Dr. Sadiq Mirza earned his medical degree from Western University of Health Sciences in Pomona, California, and completed his psychiatry residency in San Bernardino, California. He has experience in both inpatient and outpatient psychiatry, and for the past five years, he has worked extensively in telepsychiatry, helping patients across a variety of care settings.

New patients can expect a collaborative, patient-centered approach grounded in open communication and mutual respect. Dr. Mirza prioritizes creating a warm and supportive environment where care is personalized to meet individual needs. His style empowers patients to take an active role in their mental health journey through informed decisions and compassionate treatment.

Dr. Mirza begins by thoroughly understanding each patient's unique history and goals during the initial session. This sets the foundation for trust and transparency. Together, they create tailored treatment plans with clear, achievable objectives. Ongoing follow-ups ensure progress is tracked, adjustments are made when necessary, and care remains responsive and effective.

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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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