Our Team

Our Team


Keith J. Horvath, PhD

The focus of my research program is to develop best practices for delivering primary and secondary mHealth interventions, particularly in the area of HIV treatment and prevention. I currently lead a number of NIH-funded studies, including studies of peer-support interventions to improve medication adherence among youth and adult persons living with HIV and PrEP uptake among HIV-negative transgender and non-binary youth. I also lead studies to examine different PrEP dosing options for sexual minority young adults. In addition to my research activities, I have instructed an undergraduate course in human sexuality and a PhD-level course in grant writing and behavioral medicine interventions.

Curriculum Vitae

Dr. Horvath is accepting applicants for Fall 2024 admission to the SDSU/UC San Diego Joint Doctoral Program in Clinical Psychology. Please visit the JDP website for more information about the program.

Faculty Associates


Stephanie Meyers (she/her) is an Assistant Professor at the UCSD School of Medicine in the Department of Infectious Disease and Global Public Health. Her research examines how intersectional identities shape experiences with stigma, substance use, and HIV-related health outcomes. She earned her doctoral degree from the San Diego State University/University of California San Diego Joint Doctoral Program in Interdisciplinary Research on Substance Use and her MA in psychological research from California State University, Long Beach. She has over 12 years of experience in the field of substance use research and is an emerging expert in identifying how intersectional approaches can be utilized to inform the development of tailored and responsive intervention and treatment efforts for vulnerable populations (i.e., people who use drugs and people living with HIV).

Postdoctoral Fellows

Stephen Ramos, PHD

Stephen Ramos (he/him) is a postdoctoral fellow who joined iHOTT in August 2022. He received his PhD in Clinical Psychology from the Illinois Institute of Technology (2022), his MA from Texas State University (2016), and his BA from the University of North Texas (2014). Prior to starting in San Diego, he completed his APA accredited clinical internship in the med/health track at the University of Florida. His research interests include HIV prevention, HIV care engagement, behavioral syndemics, and marginalized populations.

John Mark Wiginton, PhD, MPH, MSW

John Mark Wiginton (he/him) is a postdoctoral research fellow in the HIV, Substance Use, & Related Syndemics training program at University of California-San Diego and San Diego State University. He earned a PhD in Social & Behavioral Science from Johns Hopkins University Bloomberg School of Public Health, and a Master’s in Public Health and a Master’s in Social Work from University of Michigan. Dr. Wiginton’s research examines how experiences of stigma (including intersectional stigma), trauma, and their sequelae (e.g., mental health concerns, substance use) contribute to HIV acquisition risks and disrupt HIV care continuum outcomes among sexual and gender diverse populations, particularly those who are multiply marginalized. He hopes to use his research to develop interventions tailored to the unique needs and strengths of these communities to optimize their sexual health and broader psychosocial wellness.

Staff Members

Lindsay Atkins, MA

Lindsay Atkins (she/her) is a research coordinator currently managing the START study. She earned her Bachelor’s degree in Cognitive Science from University of California, San Diego and her Master’s degree in Forensic Psychology from California Baptist University. She has over 8 years of experience in the fields of substance use and mental health research. She is passionate about helping disadvantaged populations and has used her work to advocate for victims of sexual assault, incarcerated individuals, and homeless animals. Her research is currently focused on improving the mental health and wellness among LGBTQ+ people with HIV.

Donovan Ackley III, PhD

Dr. Donovan Ackley III (he/him) is a Program Specialist in the Department of Psychology and Training and Curriculum Coordinator in the School of Social Work at San Diego State University Research Foundation. He has experience conducting focus groups and analyzing qualitative data for the Expanding Medication-Assisted Treatment in County of San Diego Criminal Justice Settings (State Opioid Response) and Trans Mental Health Survey 2017 (Trans Lifeline) and in curriculum development and training for peer support interventions with people living with HIV/AIDS (SAMHSA) and transgender people (Trans Lifeline’s operator training and Contact USA accreditation). As a California Alcohol and Drug Counselor, he has facilitated training of others in the field after several years working directly in the Drug Medi-Cal Organized Delivery System with people in residential treatment for recovery from substance use and co-occurring disorders.

Graduate Students

Michael Miller-Perusse, MS

Michael Miller-Perusse (he/him) is a current student in the San Diego State University/University of California San Diego Joint Doctoral Program in Clinical Psychology. He received his Bachelor of Science degree from the University of Michigan, where he worked as a research assistant at the Center for Sexuality and Health Disparities. Michael’s research interests broadly include minority stress and resilience among sexual and gender minorities, as well as the ways these factors interact with other biopsychosocial determinants to influence health disparities. His research has focused specifically on sexual health and HIV/AIDS.

Junye Ma, MA

Junye Ma (he/him) is a PhD student in the San Diego State University/University of California San Diego Joint Doctoral Program in Clinical Psychology (JDP). He received his bachelor’s degree in psychology and Japanese linguistics from the State University of New York at Buffalo and a master’s degree in clinical psychology from Northwestern University. Before joining JDP, Junye worked as a study coordinator at the Institute for Sexual and Gender Minority Health and Wellbeing (ISGMH). Junye’s research interests focus on structural and sociocultural determinants of sexual health disparities (e.g., PrEP awareness/uptake; HIV treatment/prevention) among LGBTQ+ people of color. He also has a special interest in the intersectionality framework and aims to design/implement culturally sensitive mHealth interventions for HIV prevention in the future.

Research Assistants

Ingrid Anna Yu

Ingrid Anna Yu (she/her) is a student in the BA Psychology program at San Diego State University. She is receiving her bachelor’s degree in Psychology with an Emphasis in Neuroscience and a Minor in Spanish. She was a Research Assistant at the Body Image, Sexuality and Health Laboratory, and is currently working as an Research Assistant at the iHOTT Laboratory and LEAF Laboratory. Ingrid’s research interests focus on Behavioral Neuropsychology, and how Adverse Childhood Events (ACEs) affect neural and behavioral development. She also has a special interest in neurological teratologies and aims to assist in researching and finding cures for them in the future.

Past Members

Josef Salazar, BS

Josef Salazar (they/he) was a student in the MA Psychology program at San Diego State University. They received their BS from the University of North Florida in 2017. After graduating they worked in community mental health doing therapeutic work with children and families on Medi-Cal. Josef’s research interests broadly include sexual health and substance abuse behaviors among sexual and gender minorities, and the use of mHealth interventions to improve health related outcomes.


Linda Mireles (she/her) was a student in the MA Psychology program at San Diego State University. She received her Bachelor of Arts degree from the University of California, Merced and after graduating she worked as a case manager for children with disabilities. She is interested in research that focuses on reducing health disparities and improving patient outcomes in the LGBT population. Linda is looking to continue working with mHealth technologies and applications to improve access to care.


Tess Walker (she/her) is a student in the Clinical Psychology doctoral program at the University of Nevada, Las Vegas. Tess worked as a research assistant in the THINK FAST lab at the University of Alabama at Birmingham, which focused on technology-based interventions to improve cognition in older adults living with HIV. Tess later received a master’s degree in Psychology from San Diego State University, where she studied mobile health (mHealth) HIV treatment and prevention interventions for sexual and gender minorities. Her research interests broadly include investigating novel approaches to improve health outcomes, and examining cognitive function in the context of underserved and aging populations. Tess enjoys camping, exploring new places, and spending time with friends and her dogs.

Gregory Chase, BA

Greg joined the iHOTT Lab as a research specialist after graduating in 2020 from Arizona State University where he was the Lab Manager of the @HEART Lab. Greg is currently pursuing his PhD in Clinical Psychology at the University of North Carolina at Greensboro under the mentorship of Dr. Michaeline Jensen. His specific research interests are in the intersection of romantic relationships, risk-taking behavior, technology use, and sexual and gender minority health.