providers/HIV specialists

Receiving care from an HIV specialist means having someone on your team who truly understands all aspects of HIV care and treatment. Our specialists dedicate their careers to recognizing HIV symptoms, addressing the complications, and developing care plans.


Thanes Vanig Post Image, CEO, CMO, M.D., AAHIVS

Thanes Vanig, CEO, CMO, M.D., AAHIVS

Board Certified Internal Medicine

Dr. Thanes Vanig opened his practice in 1998 after graduating Magna Cum Laude as a King’s Scholar from Mahidol University Medical School in Thailand, completing his Internal Medicine residency at Harvard Medical School, and receiving his Postdoctoral Fellowship in Infectious Diseases from Stanford University Medical School. Internationally recognized in HIV Medicine, he speaks, publishes, and advises regularly. Dr. Vanig serves on the City of Phoenix Fast Track Cities Initiative and is a leader for the Maricopa START (State of Arizona Rapid Treatment) Program, immediately linking newly diagnosed HIV patients to care.

M. Isabel Brady Post Image, PA-C

M. Isabel Brady, PA-C

Physician Assistant

After dedicating 12 years to social work, Isabel returned to school to become a Physician Assistant at Pacific University, where she graduated with a Master’s degree in 2004. In 2017, she retired from the Maricopa County Department of Public Health. With more than 30 years of her life passionately involved in the LGBTQ community, Isabel is an AAHIVM Certified Specialist, specializing in PrEP, PEP, HRT, and transgender care.

Judith Bergman Post Image, FNP-C, AAHIVS

Judith Bergman, FNP-C, AAHIVS

Certified Family Nurse Practitioner

After ten years working as an RN in multiple specialties, Judy returned to college, where she received her Master’s degree in Nursing and Family Nurse Practitioner. For nearly 20 years, she has been an AAHIVM certified HIV specialist. Judy’s passion lies in treating individuals who have been affected by HIV and working to prevent new infections through PEP and PrEP. She feels privileged to be invited by her patients on their journey to health.

Katie Schaub Post Image, DNP, FNP-C

Katie Schaub, DNP, FNP-C

Certified Family Nurse Practitioner

After years of working in the pharmaceutical industry, Kate returned to college to study nursing. Upon completing her RN, she worked on a cardiac monitored floor while obtaining her Doctorate of Nursing Practice in Family Practice from Arizona State University. Before joining Spectrum, Kate worked in an Urgent Care setting where she provided PrEP and PEP care. HIV prevention has become her passion in healthcare, and she specializes in PrEP, PEP, and general medicine.

Ethan Nguyen Post Image, NP-C

Ethan Nguyen, NP-C

Certified Nurse Practitioner

Ethan is the newest Certified Nurse Practitioner at Spectrum Medical. He graduated with his undergraduate degree from Arizona State University and continued his education with the nurse practitioner program at The University of Phoenix. He has over five years of RN experience ranging from ER to ICU and neurology.  He specializes in PrEP, PEP, HIV, and general medicine.

Ethan shares and strives for Spectrum’s common goal to end HIV by 2030 and to provide unmatched care to the LGBTQ community.

Have been a patient for a number of years. Dr. Vanig is great physician. He is never in a rush and takes his time to hear your concerns. The clinic has undergone some renovations looking fresh and modern. I saw Santos today, he is awesome, very patient, friendly, courteous and professional. Took his time to diagnose me and just great. Front office staff was very accommodating and I got an appointment within 24 hours of calling. Highly recommend this practice.

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