Tanya Clark Perez, PA-C – a native of El Paso, Texas, joined the clinic in 2017. She attended the University of Texas Health Science Center at San Antonio and obtained a Master’s degree in Physician Assistant Studies. PA Perez completed her undergraduate degree in microbiology at the University of Texas at El Paso and later a post-baccalaureate program in Clinical Laboratory Sciences at UTHSCSA.

She has practiced internal medicine for seven years and has a special interest in preventative care and the role it plays in her patient’s health and wellness. PA Perez focuses on patient education to help patients achieve the quality of life that they desire. She is fluent in English and Spanish. Tanya is also an HIV Prevention Certified Provider.

Dr. Cates – I grew up in Dallas, TX as a closeted gay kid. Being around southern culture and seeing the discrimination LGBTQ people faced kept me in the closet until medical school. After graduating high school, I moved to San Angelo, TX to get my Bachelor’s degree in Biology with minors in business and chemistry. From there, I moved to College Station to get a Master’s Degree in Public Health. Next, I went to Lake Erie College of Osteopathic Medicine at Seton Hill for medical school in Greensburg, PA. I was there first 2 years during the lecture years, then spent 2 years in Elmira, NY for my clinical rotations. During this time, I got to do an away rotation at an HIV clinic in Dallas, where I got my first taste in the field and loved it. After finishing medical school, I did my residency in Internal Medicine in Searcy, AR.

While in Arkansas, I witness the discrimination LGBTQ people face in healthcare first hand, and initially laid low and kept my head down. I had a student tell me, “I hope you find God” after finding out I was engaged to my partner. I had nurses make comments behind my back that would come back to me. I witnessed an attending speak down about a transwoman he was admitting to me. I witnessed a trans patient begging to have a doctor accept her, as she needed her hormones. I had enough of these abuses. There was only so much I could do as a resident, so I did what I could and educated my peers. I did several lectures regarding LGBTQ health issues so others were aware of what we faced.

This ignited a passion and led me to complete a fellowship in LGBTQ Healthcare and HIV at University of California at Los Angeles (UCLA). It was the first of it’s kind, and I was the first to go through. It was an empowering and incredibly rewarding experience. I now feel prepared to take what I learn to provide care for my community in the south, where I feel it is desperately needed. I feel proud and excited to be joining AARC in providing that care.”


Dr. Manuel Endo – was awarded his Doctorate in Medicine from Universidad Libre in Cali, Colombia. He did his social service training transferring critically ill patients from isolated communities in the Colombian pacific coast to high-complexity medical centers located in the most important cities of Colombia. Subsequently, he completed his Residency in Internal Medicine and Fellowship in Infectious Diseases at the University of Texas Health Science Center in San Antonio, Texas.  

Dr. Endo has a special interest in the prevention and treatment of metabolic diseases of patients living with HIV, gender-affirming therapy, and penicillin allergy. Dr. Endo is a very physically active physician; he enjoys playing competitive soccer and working out at the gym as he believes doctors should be role models of cardiovascular fitness for patients.

Dr. Endo looks forward to providing excellent care to the AARC community.