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Our Team

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Eden Adafre
Recruitment Assistant
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Eden is currently attending San Francisco State University's undergrad Public Health program and has future plans to pursue her MPH. She currently works at CSUH as a Recruitment Assistant. She previously has spent her summers in Ethiopia, working in harm reduction. She is passionate about maternal health, reducing stigma around substance use and is a fierce advocate for social and racial equity. In her free time she enjoys live music, going to the beach, and practicing self care.

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Sarah Brennan
Research Program Coordinator
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Sarah received her BA from UC Berkeley in interdisciplinary studies. She has been working and volunteering in harm reduction for six years and has been a Research Associate at CSUH for three. Sarah once encountered a turtle in the desert who tried to eat her shoelace. It is the closest she has ever come to being attacked by a wild animal.

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Rowan Collins, MPH
Research Associate
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A Bay Area native, Rowan has been a fighter for equity and equality from a young age. They earned their Bachelor's of Science in Oceanography from Humboldt State University in 2017 and their Master of Public Health from Southern New Hampshire University in 2023. Trans health equity, harm reduction, and the impact of climate change on health are their main areas of interest. When not at work, Rowan can be found going on adventures with their dog, getting crafty, or doom-scrolling social media.

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Annie Fraser
Research Program Coordinator
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Annie graduated from Georgetown with a BS in Global Health before joining CSUH as a Research Associate. She is passionate about harm reduction and sex worker rights, and previously worked at HIPS in Washington DC and the Women's Community Clinic in San Francisco. Her favorite things are, in order: her fish (5 tanks currently), her poison dart frogs, egg salad sandwiches, and small versions of large things.

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Gerard Legaspi
Research Associate
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Gerard recently graduated from UC Berkeley with a B.S. in Molecular Environmental Biology where he grew his interest in public health. Before becoming a research associate for the HiNT and Harness studies, he has worked in the fields of environmental health and infectious disease at state and city health departments and as an EMT in the bay area. Gerard loves caring for his many plants, going to concerts, reading, listening to new music, and trying out new restaurants of various cuisines!

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Tim Matheson, PhD, MS

Intervention Director/

Counseling Supervisor

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Tim is a clinical psychologist who has been employed at SFDPH for the past 18 years. Tim has a BA from the University of Denver, MS in clinical psychology from SF State University, and a Ph.D. in Clinical Psychology from the Center for Psychological Studies. Tim can be found outdoors engaged in some physical activity: hiking, backpacking, camping, bicycling, kayaking, paddle-boarding, rafting, downhill and x-country skiing, snowshoeing, ice skating, sledding, etc.

Full bio

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Emily Pope, MPH
Research Associate
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Emily graduated from UC Berkeley with BAs in Molecular & Cell Biology and English, and she received her MPH from the University of San Francisco. Before joining CSUH, Emily worked in supportive housing where she found a passion for harm reduction and end-of-life care. In her free time she likes to read in the park and dance in her kitchen. 

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Judy Tan, MPH
Clinical Research Program Manager
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Judy received her BS in Human Science from Georgetown University and MPH in Epidemiology/Biostatistics from UC Berkeley. She has a passion for health equity, which threads through her previous work in youth opioid prevention and environmental health as well as her current work in harm reduction. When she is not working, Judy enjoys sourdough baking and any type of physical activity, most recently pickleball.

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John Walker, MSN, FNP-C
Research Clinician
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John is a research clinician at CSUH. He earned his Masters of Nursing at Samuel Merritt University in 2013 and is a board-certified family nurse practitioner. His interests include working with marginalized populations to improve their outcomes regarding substance use and access to health care. He also works to reduce the stigma associated with drug use. John has a Miniature Pinscher, Petal, who is the apple of his eye.

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Marley Antolin Muniz
Research Associate
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Marley recently graduated from CSU East Bay with a BS in Health Science. Since graduating, Marley has pursued a career in research which centers community input, health equity and social justice. Their passion for improving the health of marginalized communities has led them to join the team at CSUH a full-time Research Associate with the LASSO study. In her free time, Marley loves to cuddle up with her senior, three-legged dog or one of her 2 cats to watch a scary movie or read a book.

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Grace Chang, MPH
Research Data Analyst
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Grace received her Bachelor of Public Health from the University of Waterloo and MPH in Epidemiology from the University of Toronto. She is passionate about health equity and social determinants of health and previously worked at the Public Health Agency of Canada analyzing Canadian youth acute toxicity deaths using coroner and medical examiner data. In her free time, Grace enjoys trying new restaurants and travelling.

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Allie Dunham
Research Project Coordinator
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Allie recently graduated from UC Berkeley with a B.A. in Anthropology and a minor in Public Policy. Her research interests include medical anthropology, poverty, and public health-- topics she hopes to explore through her work on the Harness and HiNT studies. Allie hopes to use her time at CSUH to make a positive impact on San Francisco communities and to explore her own passion for health research. In her free time, Allie enjoys backpacking, taking pictures of her cat Jelly Bean, and making music playlists for every mood.

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Janet Ikeda, MA

Clinical Research Program Manager 

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Janet received her Masters of Education from Stanford University and trained at the Center for AIDS Prevention Studies at UCSF. Janet went to Guatemala on a Fulbright Scholarship and then became a fellow at the CDC outpost at the Universidad del Valle studying the TB and HIV pandemics in rural Guatemala. 

Full bio

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Xochitl Luna Marti, MPH

Clinical Research Program Manager

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Xochitl received her BA in Health and Societies and Master of Public Health from the University of Pennsylvania. Previously, she worked as a Research Coordinator for Penn’s Center for Public Health Initiatives, contributing to various projects on digital health privacy, adolescent health, and harm reduction. In her free time, Xochitl enjoys outdoor activities and Latin dancing.

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Vanessa McMahan, PhD

Research Scientist
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Vanessa is a Research Scientist at CSUH. She received her doctorate and Master of Science from the University of Washington in Health Services. She is dedicated to harm reduction and evaluating programs to improve well being among marginalized communities. Previously, Vanessa coordinated PrEP studies among people who use methamphetamine and has volunteered with syringe services programs since 2000.

Full bio

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Rachael Renton, MSN, RN, NP-C
Research Clinician
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Rachael is a board-certified adult-gerontology nurse practitioner who completed her MSN at UC San Francisco in 2021. She is passionate about harm reduction as it applies to both substance use and sexual health (and all things health-related). She is excited to support the missions of both CSUH and CIAO in her current roles as Research Clinician and Clinician Trainer. In her free time, she likes to hang out at home in the East Bay with her partner and her cat, read a book, see live music, and enjoy the great outdoors.

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Sophia Tavasieff
Recruitment Assistant
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Born and raised in San Francisco, Sophia Tavasieff has spent the last few years pursuing her BA in Sociology at the University of British Columbia in Vancouver, Canada. Having lived in two cities with acute housing crises and overdose epidemics, Sophia is very passionate about harm reduction practices and systematic change that respects and uplifts our unhoused neighbors, and is thrilled to be channeling that passion into her work as a Recruitment Assistant with the Center on Substance Use and Health. She is currently pursuing her Community Heath Worker Certificate at CCSF and looks forward to pursuing an MSW or MPH in the coming years. When Sophia is not at CSUH, she enjoys performing comedy, clown, improv, and dance; gardening; spending time with her many cats; and exploring vegan and vegetarian restaurants around the city. 

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Brian Wylie, OTD, MPH

Program Director
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Brian is a San Francisco and Bay Area native. He received a BA from UC Berkeley, an MPH from Harvard, and a Doctor of Occupational Therapy from USC. When not he’s not at work he likes to write. Maybe someday all his writing will culminate in a book! But just maybe.

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Andrew Balcazar

Recruitment Assistant

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Andrew received his BS in Public Health from San Francisco State University as well as a BA in Music. He currently works at CSUH as a Recruitment Assistant. He plans to pursue a Master's in Public Health and continue his work towards health equity and social justice. In his free time, he enjoys live music, all things pop culture and brewing kombucha at home.

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Phillip Coffin, MD, MIA,

FACP, FIDSA

Director

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Phillip is a board-certified and practicing internist, infectious disease specialist, and addiction medicine specialist. He attended or trained at Brown University, Columbia University, the University of California San Francisco, and the University of Washington.

Full bio

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John Farley

Recruitment & Community Relations Manager

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John graduated with an AS in business from Cape Cod Community College. John began work with SFDPH in 2004 and completed his BA in Sociology. He has a strong passion for working in the HIV-care field and creating better health outcomes for people who use substances. John loves film. His all-time favorite movie is ‘Mary Poppins’ and his favorite actors are Reese Witherspoon, Timothee Chalamet and Lucas Hedges.

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Kat Jeronimo
Research Program Assistant 
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Kat is a recent graduate of Boston University, where she received a Bachelors of Science in Human Physiology with a minor in Public Health. She has a background in maternal and child health, and is excited to switch focus to harm reduction and academic detailing. In her free time, Kat is often found channeling her inner grandma by crocheting or recklessly spending money to grow her novel collection.

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Rebecca Martinez, FNP
Research Clinician
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Rebecca is a board-certified family nurse practitioner, who completed her Master’s of Science in Nursing at UCSF in 2014. She has made her professional home at the intersection of HIV prevention, harm reduction, and primary care, and is energized by her community on a daily basis. Rebecca lived in Spain when she was 14 with her family and blames her parents for her ongoing wanderlust.

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Ella Parker
Research Associate
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Ella graduated from UC Berkeley with a BA, double majoring in Interdisciplinary Studies and Social Welfare. Her previous experience includes working in an inpatient psychiatric facility as a mental health case worker and shift supervisor where she provided substance use and mental health counseling for patients under LPS conservatorship. Ella has experience working in social movements where she worked in political education and provided dyad-model peer counseling with community organizers. Ella is interested in pursuing a career in public health research and mental health work and is dedicated to bettering the health of our substance-using and unhoused populations. In her free time Ella loves to bike, attend movie screenings and free concerts in the Bay, and cook!

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Milo Santos, PhD, MPH

Senior Research Scientist
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Milo is a Senior Research Scientist at CSUH and an Associate Professor in the Department of Community Health Systems at the University of California San Francisco (UCSF). He obtained his Ph.D. in Epidemiology and Translational Sciences at UCSF and his MPH in Epidemiology and Biostatistics at the University of California Berkeley.

Full bio

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Kayla Tewahade
Research Associate
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Kayla graduated with a BS in Public Health and minor in Biology from Santa Clara University. She is looking to become a Physician Associate in the future and eventually work in an international setting providing healthcare services to underserved populations. Kayla is passionate about holistic health and the mind-body connection. Previously she worked as a medical assistant in an Orthopedic Surgery Center, as well as in the business development side of a preventative care start-up. She is looking forward to dedicating her time to the advancing of treatments for vulnerable populations to bring more equity in healthcare. In her free time Kayla loves to practice yoga, read self-development books, listen to new music, and spend time working at her favorite vintage clothing & art store.

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Petal

Canine Clinician

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Petal’s research interests include determining canine tolerability of squeak versus crinkle toys and cheese versus other treats. Her favorite toy is a round, squeaky gingerbread man who lost his nose on the first day. In her spare time, Petal likes to lick her Dad’s head.

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