Out-Patient Providers

Aviv Itzhaki MD, MPH

Managing Partner

Dr. Aviv Itzhaki relocated to Las Vegas from Gainesville, Florida, to bring high-quality mental health care back to his hometown. He completed his dual M.D. and Master’s Degree in Public Health before undergoing his internship and psychiatry residency training at the University of Florida.

Before joining Focus Mental Health Solutions, Dr. Itzhaki served veterans at the Veterans Administration in both Florida and Nevada. Now serving as both the Medical Director of Outpatient Services and the Associate Program Director of Residency Training, he leverages his extensive experience to mentor the next generation of physicians and expand mental health access in the greater Las Vegas area. Outside of his practice, he enjoys spending time with his family, playing various sports, and exploring the outdoors. Dr. Itzhaki is dedicated to providing comprehensive care and invites you to schedule an appointment at the new Focus Mental Health Outpatient Clinic.

Sue Won Lee, D.O.

Dr. Lee is a general psychiatrist and a licensed Osteopathic Physician (DO) dedicated to providing comprehensive and compassionate mental health care. She earned her undergraduate degree from the University of California, Los Angeles (UCLA) before completing her medical education at Touro University College of Osteopathic Medicine. She then went on to complete her residency training at the Sunrise Health Graduate Medical Education Consortium, where she was elected Chief Resident during her final year.

Dr. Lee brings a unique depth of expertise to the clinic, treating a broad range of psychiatric diagnoses with experience across all levels of clinical care. She is actively involved in treating patients in inpatient settings, Partial Hospitalization and Intensive Outpatient Programs (PHP/IOP), and the traditional outpatient clinic. This broad involvement allows her to seamlessly support individuals at every stage of their treatment, ensuring continuity and a highly personalized approach to long-term recovery and wellness.

Chantel Lewis, DO

Dr. Lewis is a general adult psychiatrist with a background spanning psychology, public health, and medicine. She earned her undergraduate degree in Psychology from the University of California, San Diego and later completed a Master of Public Health at the University of Southern California. She received her medical degree from Touro University Nevada and completed her psychiatry residency with the Sunrise Health Graduate Medical Education Consortium in Las Vegas.

Her clinical practice includes the evaluation and treatment of a wide range of mental health concerns, with an emphasis on understanding each patient as a whole rather than focusing solely on a diagnosis. She values a collaborative, holistic approach to care that considers not only medication and therapy, but also sleep, exercise, nutrition, and other lifestyle factors that can support mental health and overall well-being.

Outside of medicine, Dr. Lewis enjoys spending time with her family, going to the beach, working out, traveling, and trying new restaurants.

Kyle Ramsay, DO

Dr. Kyle Ramsay grew up in Torrance, California. He completed his undergraduate education at California State University, Fullerton before moving to Las Vegas, where he earned his Doctor of Osteopathic Medicine degree from Touro University Nevada. He subsequently completed his psychiatry residency training at the Kirk Kerkorian School of Medicine at UNLV.

Dr. Ramsay is a general adult psychiatrist who practices in both inpatient and outpatient settings. He treats a broad range of psychiatric conditions and utilizes a combination of evidence-based medication management and psychotherapy tailored to each patient’s individual needs and goals. He values a collaborative approach to treatment and the development of a strong therapeutic relationship with his patients.

Outside of work, Dr. Ramsay enjoys spending time with his family, reading, going to Ace’s or Golden Knights games, and building computers.

Kenisha Tapia, D.O.

Dr. Tapia is a general psychiatrist dedicated to providing compassionate, evidence-based mental health care. Born and raised in the San Francisco Bay Area, she earned her Bachelor of Science degree in Neurobiology, Physiology, and Behavior from University of California, Davis. Dr. Tapia moved to Las Vegas to pursue her medical education at Touro University Nevada, where she received her Doctor of Osteopathic Medicine degree. She subsequently completed her psychiatry residency training through the Sunrise Health GME Consortium in Las Vegas.

Dr. Tapia treats a wide range of psychiatric conditions, including mood disorders, anxiety disorders, psychotic disorders, ADHD, and substance use disorders. She has a particular interest in outpatient psychiatry and geriatric mental health and strives to develop individualized treatment plans that support each patient’s unique goals and circumstances. Her approach emphasizes collaboration, empathy, and a strong therapeutic relationship, helping patients navigate challenges while promoting long-term wellness and quality of life.

Outside of work, Dr. Tapia enjoys spending time with her family and her corgi, exploring new restaurants, and discovering new crafting hobbies.

Tyler Voss-Hamrick, D.O.

Dr. Tyler Voss-Hamrick is a general psychiatrist in Las Vegas, Nevada. He was born and raised in Las Vegas. He studied biological sciences at UNLV and attended Touro University Nevada medical school. He completed his residency program at Sunrise Health GME consortium in Las Vegas. Dr. Voss treats a variety of psychiatric conditions including mood disorders, anxiety, psychosis, ADHD, and substance use disorders. He utilizes a combination of medication management and psychotherapy.

During his free time, he enjoys playing and watching sports, trying different cuisines, and spending time with family.

Josh Clemmer, PMHNP

Josh is a California transplant who believes Las Vegas is a not-so hidden gem in the desert, and a place he is happy to call home. He graduated Cum Laude with a Bachelor of Science in Nursing from the Johns Hopkins School of Nursing in 2015. In 2021, he finished graduate school at the top of his class with a Master of Science in Nursing from Case Western Reserve University, and is now a board certified Psychiatric Mental Health Nurse Practitioner.

During graduate school, Josh started his training in outpatient psychiatry and ketamine clinics here in Las Vegas, Nevada. He then moved to Baltimore, Maryland to complete his clinical education at the Johns Hopkins Hospital under renowned experts in adult psychiatry and psychology. Josh believes in a holistic model of care, where evidence-based lifestyle and psychotherapeutic techniques complement medication management strategies to achieve individual treatment goals. He is especially interested in supporting the human response to mental illness, as well as exploring emerging medication options in the field of psychiatry.

Josh has considerable inpatient experience as a psychiatric RN, working with adults, children, and adolescents in various settings. His time at the bedside has given him unique insights into the impact mental illness has on patients and their families. He is passionate about reducing the stigma surrounding mental health issues, and providing patient-centered, trauma-informed care.

In his free time, Josh enjoys the company of friends and family, including his wife and dog, as well as grounding himself in the beautiful outdoor playground that surrounds Las Vegas.

Isabel Garewal, PMHNP-BC

Isabel Garewal is a board-certified Psychiatric-Mental Health Nurse Practitioner with a background in behavioral health and nursing leadership. She earned her master’s degree from Northern Arizona University, completing a portion of her graduate clinical training at Focus Mental Health Solutions, where she now provides psychiatric care.

Her approach integrates DSM-5-TR diagnostic criteria, validated screening tools, and a bio-psychosocial perspective to understand each patient’s symptoms and individual circumstances. Isabel incorporates motivational interviewing and shared decision-making into evidence-based medication management, developing individualized treatment plans that reflect each patient’s needs and goals.

Olivia Huntzinger, PA-C

Olivia was born and raised in a small town in Alabama. She was active in college with many leadership roles and found a passion for healthcare after volunteering with Hospice for several years. She graduated Magna Cum Laude from the University of Alabama in Huntsville where she received a Bachelor of Science in Biology with a Chemistry Minor. She then worked as a care assistant in a memory care/dementia unit for over a year to build her patient care skills before attending graduate school.

Olivia attended the University of Tennessee Health Science Center PA Program in Memphis Tennessee and graduated with her Master’sin Medical Science- Physician Assistant in 2018, became board certified, and pursued a career in psychiatry. She has been with Focus Mental Health since 2018 after moving to Nevada with her husband.

Olivia believes in working together with her patients to find a medication regimen that improves functionality and overall wellbeing while also offering resources outside of medication management like psychotherapy. She treats patients with compassion and empathy, understanding that each patient has unique mental health needs and requires a tailored treatment plan that fits those needs.Outside of work, Olivia enjoys relaxing at home with her spouse and spending time with her pets.

Ryan Nokes, PA-C

Ryan is originally from Northern Virginia and completed his undergraduate studies at the University of Tennessee in 2009. Before pursuing graduate medical studies, he gained experience as a pharmacy technician and worked in a blood donation clinic. Driven by a commitment to patient care, he earned a Master of Biomedical Sciences in Physician Assistant Studies from the University of Toledo in 2015.

Ryan moved to Las Vegas in 2016 and worked for seven years in the Emergency Department at UMC. During that time, he recognized a significant need for psychiatric services in the region and began practicing as a psychiatry PA part-time in 2020. He has since transitioned to a full-time clinical setting, where he treats patients with various conditions, including substance abuse, depression, anxiety, PTSD, ADHD, and other mood disorders.

He is dedicated to serving diverse and underserved communities through a collaborative and holistic approach, while encouraging patients to participate actively in their treatment.

Outside of his practice, he enjoys visiting the Pacific coastline, hiking, and exploring the Las Vegas food scene. He is also a passionate fan of live music and sports.

Brittany Perez, PMHNP-BC

Brittany is a proud Las Vegas local. She graduated as a registered nurse from the College of Southern Nevada in 2013 and attained her Bachelor’s in Nursing from Nevada State College in 2017. She was a pediatric emergency nurse at UMC for 10 years before returning to school to become a psychiatric-mental health nurse practitioner. She graduated with her Master’s in Nursing from the University of Nevada, Las Vegas in 2023.

Brittany is passionate about child and adolescent mental health. She advocates for the importance of early intervention for an improved life trajectory. She believes in treating the whole child utilizing multiple therapeutic modalities including therapy, exercise, and parenting interventions.

In her free time, Brittany spends time with her family or working at large events and festivals as a nurse.

Umar Ansari, DO

Dr. Ansari is a PGY-3 Psychiatry resident in Las Vegas, Nevada. He earned his bachelor’s degree in Psychology from University of California, San Diego and received his medical degree from Western University of Health Sciences College of Osteopathic Medicine in 2024.

Outside of medicine, Dr. Ansari enjoys playing sports, following basketball, traveling, exploring new restaurants, and spending quality time with his family, friends, and his nephews.

Marie Chuapoco, DO

Dr. Marie Chuapoco, DO is a PGY-3 psychiatry resident at Sunrise Health Psychiatry Residency. Originally from Las Vegas, she is a graduate of the Touro University Nevada, where she earned both her medical degree and a Master’s of Health Sciences. Patient enjoys watching television & movies, trying new restaurants, and going to concerts in her spare time.

Renee Delos Angeles, DO

Dr. Renee Delos Angeles, DO, is a PGY-4 Psychiatry Resident at Sunrise Health Psychiatry Residency. A Las Vegas native, Dr. Delos Angeles earned her undergraduate degree from the University of Nevada, Las Vegas (UNLV) before attending Touro University Nevada for medical school.

Outside of medicine, Dr. Delos Angeles enjoys spending time outdoors, especially hiking, and making memories with her dog. When she’s not caring for patients, you can likely find her enjoying the Nevada sunshine or discovering another favorite local spot beyond the strip.

Naomi Graham, MD

Dr. Naomi Graham, MD, is a resident psychiatrist dedicated to expanding access to mental health care in Las Vegas. Originally from Alaska, Dr. Graham earned her undergraduate degree from the University of Washington before attending medical school at Universidad Autónoma de Guadalajara in Mexico. Fluent in Spanish, she spent five years living and working in Mexican hospitals and clinics before beginning her residency in Las Vegas, experiences that strengthened her commitment to serving diverse communities with culturally responsive care. Dr. Graham is passionate about improving access to mental health services in Nevada. She warmly welcomes all adult patients, including Spanish-speaking individuals, and is pleased to provide care in their preferred language. In her free time, she enjoys walking her dog with her husband, exercising, and exploring coffee shops throughout the Las Vegas Valley.

Eric Mendez, MD

Dr. Eric Mendez, MD, is a PGY-3 psychiatry resident at Sunrise Health Psychiatry Residency. Originally from Los Angeles, California, he is a graduate of the University of Cincinnati College of Medicine, where he earned both his medical degree and an M.S. in Physiology. During his training, Dr. Mendez was recognized with an award for his research contributions, which multiple first author publications. Outside of medicine, Dr. Mendez enjoys both watching and participating in sports. He also has a passion for film and enjoys spending his free time watching movies and sharing those experiences with his spouse.

Brooke Minetto, DO

Dr. Minetto graduated magna cum laude from Minnesota State University with a Bachelor of Science in Biology before earning her Doctor of Osteopathic Medicine degree from Touro University Nevada. As Chief Psychiatry Resident, she is committed to supporting and mentoring her fellow residents while continuing to grow as a physician and advocate for her patients.

Her clinical interests include acute inpatient psychiatry and consultation-liaison psychiatry, while she also values the opportunity to establish meaningful, longitudinal relationships with patients in the outpatient setting. Dr. Minetto is dedicated to providing compassionate, patient-centered mental health care and takes an individualized approach to understanding and addressing a wide range of mental health conditions.

Outside of psychiatry, Dr. Minetto enjoys hiking, working out, and spending quality time with family and friends.

Ansab Sheikh, DO

Dr. Ansab Sheikh, DO, is a PGY-4 Psychiatry Resident at Sunrise Health Psychiatry Residency and a graduate of Touro University Nevada College of Osteopathic Medicine. During medical school, he developed an interest in research and was published for his work in examining patterns of extended-release naltrexone for the treatment of opioid use disorder. Outside of medicine, Dr. Sheikh enjoys staying active and following his favorite sports, particularly basketball and football. His interests outside of medicine bring a balance of competition, fitness, and plenty of time with his favorite four-legged companions and his wife.

Rachel Lillis, General Manager

Rachel Lillis, our General Manager, has 15+ years’ experience in administration, from payroll to accounts payables, in both the construction field as well as dermatology.

Rachel was born in New Jersey and has lived in Las Vegas for the last 25+ years. When not at work, Rachel enjoys spending as much time as possible outdoors; soccer games, hiking, snowboarding and everything in between with her son and husband.