Clinicians

Meet Our Dedicated Team

Sasha Bergeron

Sasha Bergeron, APRN

APRN – Adult

Michael Bogrov, MD

Michael Bogrov, MD

Psychiatrist – Child and Adult

Caroline Cregan

Caroline Cregan, MD

Psychiatrist – Child and Adult (specialist in children under the age of 13)

Marc Dalton, MD

Michael Dalton, MD

Psychiatrist – Child, Adult, Forensic, LGBTQ

Patricia Frischtak, MD

Patricia Frischtak, MD

Psychiatrist – Child, Adult

Christopher Raczynski, MD

Christopher Raczynski, MD

Psychiatrist – Child, Adult, and Forensic

Navin Reddy

Navin Reddy, MD

Psychiatrist – Adult and Addiction

Leslie Rokoske, MD

Leslie Rokoske, MD

Psychiatrist – Adult

Ashvin Sood

Ashvin Sood, MD

Psychiatrist – Child and Adult

Emi Leiner

Emi Leiner, APRN

APRN – Child and Adult

Mackenzie Dajani, LPC

Mackenzie Dajani, LPC

Counselor- Adult, KAP

Ann Norwood

Ann Norwood, MD

Psychiatrist, Adult, KAP

Nursing Staff

At the core of our philosophy lies a resolute belief: nursing stands as a cornerstone within our ketamine clinic and will undeniably shape the trajectory of psychedelic medicine clinics to come.

Samantha Marzi, APRN

Samantha Marzi, APRN

Samantha is a board-certified Psychiatric-Mental Health Nurse Practitioner located in Washington, DC. She holds a master’s degree from Wilkes University and has a unique background, having previously worked as a registered nurse while providing comprehensive care for patients receiving ketamine treatments. In addition to her dedication to the field of mental health, Samantha proudly serves her country as an officer in the D.C. National Guard and has a distinguished history of active duty service in the United States Air Force. Her extensive nursing experience covers a wide spectrum of specialties, including operating room expertise, emergency deployment medical operations, and psychiatric care. Beyond her professional life, Samantha finds joy in spoiling her beloved dog, Culper, and pursuing woodworking as a creative outlet. She is an advocate for a balanced and fulfilling life, embracing interests like yoga, travel, and the art of crafting fresh pasta.
Kathryn Looney, RN, CCRN, CSC

Kathryn Looney, RN, CCRN, CSC

Director of Operations

With a nursing journey that began in 2008, Kathryn has spent the last 13 years immersed in Intensive Care Units. Her expertise spans trauma, neurological, and medical/surgical ICU settings, which laid a strong foundation for her subsequent 8-year focus on cardio-thoracic ICU care and Extracorporeal Membrane Oxygenation (ECMO) patients. Kathryn’s credentials include certification from the American Association of Critical-Care Nurses in both Adult Critical Care Nursing and Adult Cardiac Surgery. Her dedication and wealth of experience make her an invaluable asset as our Director of Operations.
Gloria Kim

Gloria Kim, RN

A decade ago, I embarked on my nursing journey, exploring roles in Med Surg and Pre-Op/PACU care, serving patients from infancy to adulthood. As a Pre-Op/PACU nurse, I’ve honed a versatile skill set, catering to both critically ill and healthy individuals. Beyond clinical excellence, I’ve come to understand the significance of offering personalized support and reassurance during patients’ distress, making a holistic approach integral to my nursing practice. My passion lies in providing not just medical care, but also emotional and psychological support to foster comfort and trust in each patient.
Amanda McNally

Amanda McNally, RN

Amanda attended nursing school at Saint Francis University in rural Pennsylvania, and her impressive career spans 18 years of ICU expertise across various specializations. In 2006, she embarked on her nursing journey at the University of Maryland Medical Center in Baltimore, MD, where she made her mark in the Medical Intensive Care Unit. Subsequently, she shifted her focus to the Surgical-Trauma Intensive Care Unit in Altoona, Pennsylvania. For the past 15 years, she has called George Washington University Hospital her professional home, specializing in the intensive care of Cardio-Thoracic patients. When she’s not passionately caring for patients at GWUH or contributing to her work at Washington Interventional Psychiatry, she cherishes precious moments with her husband, two kids, and their beloved dog, indulging in RV camping adventures at scenic parks throughout Virginia.
Siobhan Kopp

Siobhan Kopp, RN

With 26 years of nursing experience, I’m a dedicated and service-oriented RN committed to delivering top-notch patient care. I excel at quick and accurate assessments, even under pressure, and work collaboratively with patients, families, physicians, and colleagues for optimal healthcare outcomes. My expertise covers critical care, ACLS, BLS, IV procedures, medical screening, patient monitoring, inpatient and outpatient care, pain management, immunization administration, and diabetes management. My role at the Advanced Surgery Center of Bethesda involves coordinating pre-procedure activities, preoperative patient care, and PACU recovery. I also mentored new RNs and managed supplies. I earned my Associate of Science in Nursing in 1994 from Montgomery College, Takoma Park, MD. My new role and passion now lies in delivering exceptional care, both medically and emotionally, to Washington Interventional Psychiatry’s patients and their families.

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