Waridibo Allison MD, PhDWaridibo (Wari) Allison, MD, PhD

Infectious disease specialist

Dr. Waridibo (Wari) Allison is an Assistant Professor of Infectious Disease at the University of Texas Health Science Center San Antonio (UT Health San Antonio) and Medical Director at the San Antonio AIDS Foundation (SAAF). She attended Imperial College School of Medicine, London and completed internal medicine residency at New York Presbyterian/Weill Cornell Medical Center and infectious disease fellowship at New York University (NYU). She holds a PhD in Public Health from the Kirby Institute, University of New South Wales, Australia. Dr. Allison is passionate about improving access to health care for under-served, disadvantaged populations in the US and in resource limited settings overseas, whether that disadvantage is geographical, racial, cultural, gender-based or economical. Her current research focuses on prevention, screening and linkage to care in relation to HIV and viral hepatitis (particularly hepatitis C). She has clinical responsibility for people living with HIV attending the SAAF Care Clinic. Dr. Allison is the principal investigator and program director for the TACKLE HIV/HCV in People of Color project.

Margaret Adjei, PharmD

Community-based pharmacist

Margaret Adjei received her Doctor of Pharmacy degree (PharmD) from St. Johns University Queens, New York. She currently works a Clinical community pharmacist with Astoria Pharmacy located inside the San Antonio AIDS Foundation (SAAF).


Raudel Bobadilla BS, CHWRaudel Bobadilla, BS, CHW

Community Health Worker Coordinator

Raudel Bobadilla is a Community Outreach Coordinator and Community Health Worker (CHW) who serves as the CHW Coordinator for the TACKLE HIV/HCV Project. He has built a strong skill set for engaging and partnering with communities, care-providers, and clinics to improve the population’s health. In multiple projects he has collaborated with community members, leaders, and organizations to connect the public to services and research opportunities. Mr. Bobadilla brings considerable experience as a Practice Facilitator and Case Manager for a CPRIT-funded grant to implement HCV screening and innovative treatment pathways within 18 clinics across 14 counties in South Texas. Through close collaboration with each clinic, Mr. Bobadilla, trains staff in program protocols, adapts the care model to the context of each site, and serves as lead contact between clinic partners and the research team.

DeWayne Davidson, PharmD, BCACP, BC-ADM

Faculty Pharmacist

DeWayne Davidson received his doctor of pharmacy degree from the University of Texas at Austin and completed a Family Medicine Ambulatory Care Pharmacy Practice specialty residency at the University of Texas Health Science Center in San Antonio. Dr. Davidson is board certified in Ambulatory Care Pharmacy Practice and Advanced Diabetes Management. He is a Clinical Assistant Professor at The University of Texas at Austin College of Pharmacy with an adjoint appointment in the UTHSCSA Department of Family & Community Medicine. In addition to educating pharmacy and medical students, he co-manages patients with chronic diseases under a collaborative practice agreement with primary care physicians in the UT Health San Antonio Primary Care Center. He is a co-author of a pharmacotherapy book chapter entitled “Health Literacy and Medication Use” and has research interests in diabetes management, health literacy, and medication adherence.

Hopethe Hubbard, MD


Hope Hubbard is a native Texan and received her medical degree from Baylor College of Medicine in Houston, Texas. She completed her internal medicine residency and hepatology fellowship at Baylor College of Medicine, and a gastroenterology fellowship at Ohio State University in Columbus, Ohio. She is board certified in gastroenterology. She is an Associate Professor of Medicine at UT Health San Antonio and is hepatology director at the Robert B. Green clinic.

Andrea Rochat, MFAAndrea Rochat, MFA

ECHO Facilitator

Andrea Rochat serves as a Senior Research Coordinator for the Center for Research to Advance Community Health (ReACH) at UT Health San Antonio. After completing dual majors in English and Classics at Washington University in St. Louis, Andrea went to Pennsylvania State University, where she earned a Masters of Fine Arts in Creative Writing. Her work in communications and content development led her ReACH, where she has served as a coordinator and writer for over three years on projects involving hepatitis C management in primary care, specialist teleconsultation, non-pharmacologic chronic pain management, and community engagement. Her background makes her passionate about improving the patient and provider experience through innovative forms of communication. As ECHO Facilitator on the TACKLE HIV/HCV project, Andrea is eager help write a newer narrative of healthcare, in which individuals are empowered through access, technology, and education to improve their own health and the health of their community.

Ruth Serrano Pinilla, MD

Infectious disease specialist

Dr. Serrano is an Assistant Professor in the Infectious Disease Division at the University of Texas Health Science Center San Antonio. Dr. Serrano provides treatment for patients requiring long term antibiotics in the Outpatient Parenteral Antibiotic Clinic (OPAT) in the Robert B Green Clinic from the University Hospital System. She is also the Medical Director of the Alamo Area Resource Center, a community clinic focused in providing integral care for LGTBQ patients and people living with HIV in San Antonio. She attended Medical School in the “Universidad de Carabobo” in Venezuela and completed Internal Medicine Residency and Infectious Diseases Fellowship in the University of Texas in San Antonio. Dr. Serrano is a strong advocate for prevention, early treatment and linkage to care for people living with HIV and Hepatitis C.

Barbara Taylor, MDBarbara Taylor, MD, MS

Infectious disease specialist

Dr. Taylor is an Associate Professor of Infectious Diseases and the Assistant Dean for the MD/MPH Program at UT Health San Antonio with a co-appointment at the UTHealth School of Public Health. Dr. Taylor conducts impactful research to improve health outcomes for underserved populations living with or at risk for HIV in San Antonio and internationally. She provides treatment for patients living with infectious diseases in San Antonio. A strong community advocate, she is a co-chair of the End Stigma End HIV Alliance of San Antonio and the Clinician Key Opinion Leader for San Antonio’s Fast Track Cities Initiative. In collaboration with the Texas Department of State Health Services, Dr. Taylor serves as the Medical Director for community-based programs to increase screening tuberculosis in South Texas. She also works with two programs to increase screening and treatment for Hepatitis C in South Texas: TACKLE and HEPVista. Her commitment to education has earned her numerous teaching and service awards. Dr. Taylor is an alumna of Princeton University, Harvard Medical School, and the Columbia University Mailman School of Public Health and is board certified in internal medicine and infectious diseases.

Carlos Tirado, MD, MPH, FABAM

Substance use disorder & addiction medicine specialist

Dr. Tirado is Board Certified in General and Addiction Medicine. He is a recognized thought leader, innovator, mentor, and clinical expert in addiction treatment and systems of care. Dr. Tirado spent the first half of his career in academia, holding faculty appointments at University of Pennsylvania and University of Texas Southwestern Medical Center. He subsequently has developed and implemented hospital, facility-based, and outpatient addiction treatment services, outpatient chronic pain management, and primary care for addiction programs. He is currently appointed as Clinical Associate Professor of Psychiatry at the UT Dell Medical School and works with CARMAhealth providing primary care for addiction and related behavioral and medical disorders.

Isela Werchan, MDIsela Werchan, MD

Psychiatrist & addiction medicine specialist

Dr. Isela Werchan is board-certified by the American Board of Psychiatry and Neurology in general psychiatry. Dr. Werchan completed her undergraduate studies at the University of Texas at El Paso. She received a medical degree at the University of Texas Medical Branch in Galveston. She completed a general psychiatry residency training at the University of Texas at Austin Dell Medical School. She is currently a general psychiatrist at CARMAhealth in Austin, TX. Special interests include cognitive behavioral therapy, cognitive processing therapy, psychodynamic psychotherapy, motivational interviewing, dialectical behavioral therapy and substance abuse group therapy. Her current focus involves the assessment and treatment of substance abuse disorders. She has experience in residential treatment program centers, inpatient psychiatric hospital care, outpatient psychiatry, and outpatient psychotherapy.

Kesi Williams, MPH

ECHO Facilitator & Coordinator

Kesi Williams serves as a Senior Research Coordinator for the Center for Research to Advance Community Health (ReACH) at UT Health San Antonio. Before joining ReACH, Ms. Williams was a program analyst for the National Institutes of Health for over 10yrs. She has also worked at the Office of the Assistant Secretary of Health and the Centers for Disease Control and Prevention.  Ms. Williams earned her Master’s in Public Health with a concentration in Community Health from the University of North Texas Health Science Center and a Bachelor of Science in Biology from Tuskegee University.