Marnie Stefan, MD

Getting to know meDr. Kishan Peddanna is a board-certified general psychiatrist with experience treating patients across the lifespan. He attended The Ohio State University for his undergraduate studies and earned his medical degree from the University of Cincinnati. Dr. Peddanna completed his residency in General Psychiatry at The Ohio State University and a fellowship in Child and Adolescent Psychiatry at Nationwide Children’s Hospital.

Dr. Peddanna values continuity of care and collaboration, working with patients toward long-term improvements while building meaningful connections. His approach is grounded in shared decision-making, ensuring treatment plans align with each patient’s goals. He has extensive experience managing conditions such as ADHD, mood disorders, and anxiety.

Dr. Peddanna’s practice focuses on medication management complemented by supportive psychotherapy. He uses evidence-based assessments and interventions to guide individualized treatment planning, fostering a care experience that is both effective and patient-centered.

Thomas Sargent, MD, holds a master's degree in pharmacology and a Doctor of Medicine from Tulane University School of Medicine. He completed his psychiatry residency at the Icahn School of Medicine at Mount Sinai West/Morningside in New York City. Over the past four years, he has treated a wide range of mental health conditions in various clinical settings. Dr. Sargent has extensive experience treating mood, anxiety and psychotic disorders, PTSD, OCD, personality disorders, and substance use issues. He utilizes both medication management and psychotherapy to provide comprehensive care. Dr. Sargent has received specialized training at the VA and the Center for Intensive Treatment of Personality Disorders in NYC. Passionate about holistic treatment, Dr. Sargent considers the biological, psychological, and social factors that influence mental health. He believes in addressing core issues through targeted care rather than defaulting to prescribing multiple medications. Dr. Sargent strives to create a supportive environment where patients can openly express their concerns. He believes in shared decision-making to ensure that care is evidence-based but also tailored to each patient's unique needs. Dr. Sargent takes the time to thoroughly explain diagnoses and treatment options, empowering patients to make informed decisions about their mental health. His approach emphasizes patient autonomy and aims to build trust, leading to more effective and personalized care outcomes.

Dr. Kathryn Bertacchi is board-certified in both adult and child & adolescent psychiatry. Originally from California, she earned her medical degree from University College Cork in Ireland and completed residency and fellowship at Emory University. She has practiced in varied settings, including developing specialized clinics in eating disorders and gender-affirming care. She is a member of several professional organizations including AACAP, APA, and WPATH.

Dr. Bertacchi fosters an inclusive, nonjudgmental environment where patients feel safe to be themselves. She approaches care with curiosity, compassion, and deep respect for each person’s unique story, aiming to help individuals feel genuinely heard and supported throughout their treatment journey.

In early sessions, Dr. Bertacchi works collaboratively to understand patients' lives, goals, and challenges. While her focus is medication management, she integrates cognitive-behavioral, humanistic, and supportive techniques. She may recommend additional therapy as needed and particularly values working with youth and adults from diverse backgrounds.

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. Jessica Marz is a board-certified psychiatrist who completed her undergraduate studies at the University of Florida and earned her medical degree from the Florida State University College of Medicine. She went on to complete her psychiatry residency at the University of Florida College of Medicine Jacksonville. Dr. Marz treats adults experiencing a variety of mental health concerns, including anxiety, depression, PTSD, OCD, ADHD, bipolar disorder, and adjustment-related challenges.

Dr. Marz is a compassionate and thoughtful psychiatrist committed to holistic, patient-centered, evidence-based care. She approaches each individual with warmth and without judgment, fostering a therapeutic environment built on open communication and trust. She believes that strong rapport is essential to achieving meaningful progress in treatment.

Dr. Marz combines medication management with supportive psychotherapy, incorporating cognitive-behavioral techniques and motivational interviewing. She customizes each treatment plan to align with the patient’s personal goals and evolving needs, recognizing that healing is a highly individualized journey.

Dr. Pilar Bare is an adult psychiatrist who completed her psychiatry residency at TriStar Centennial Medical Center in Nashville, Tennessee, where she served as Chief Resident. She earned her medical degree from Western University of Health Sciences College of Osteopathic Medicine of the Pacific Northwest in Oregon, where she studied osteopathic medicine which shaped her holistic view of health. She completed an intern year in Family Medicine at the University of Arkansas for Medical Sciences West. She holds a bachelor's degree in chemistry and biology from the University of Arkansas, where she graduated with honors.

Outside of work, she enjoys hiking, backpacking, visiting national parks, and spending time with her senior dog.

Dr. Bare believes that each individual's background plays a significant role in their mental health, and understanding a patient's personal story is critical to their healing journey. She believes in a respectful, collaborative relationship built on trust and open communication. While Dr. Bare integrates evidence-based medication management when clinically appropriate, she also emphasizes the therapeutic benefit of addressing lifestyle, relationships, and internal narratives.

Dr. Bare begins care with a thorough evaluation, exploring developmental history, impactful life events, and emotional patterns. From there, she develops a comprehensive treatment plan that may include medications, wellness strategies, and therapist collaboration. She considers each patient's strengths and challenges to guide care that promotes long-term recovery and personal growth.

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