Our Team

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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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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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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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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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Mackenzie Robinson

Research Associate
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Mackenzie graduated from UCLA with a BA in Psychology and Global Health before eventually joining CSUH to work on the REBOOT study. She hopes to attend graduate school for social work and continue to work in the public health sphere. Mackenzie is an avid baker and dancer and has near encyclopedic knowledge of the beauty industry. 

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K.C. McNaughton
Research Associate
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K.C. received her BA in anthropology and sexuality studies from San Francisco State University. It was there she developed an interest in harm reduction and trauma-informed care. Aside from her work at CSUH, K.C. studies alcohol use among LGBTQ+ young adults living in the Bay Area. When she is not working, she is crafting, making late-night El Farolito runs, or taking her deaf/blind French bulldog to the vet hospital.

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Kyna Long, MS
Research Data Analyst
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Kyna received her MS in Biostatistics from Washington University in St. Louis. Clinical trials research has always held her interest and working and growing with CSUH is an exciting opportunity to learn more. Kyna is a complete homebody and in her free time, she likes to be the designated lap for her two cats, get stressed out while playing video games, work out, and nap (with her cats).  

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Michael Nguyen
Recruitment Assistant
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Michael graduated from The University of Texas at Dallas with a BS in Healthcare Management. He is currently in his Master in Social Work program at San Jose State University while interning at a non-profit supporting unhoused individuals. He will be a clinical trainee intern next year at a non-profit agency in the Tenderloin providing mental health services to community members. His passion for harm reduction, public health, and mental health drive him to provide compassionate and affirming care & services. In his free time, Michael enjoys live music, dancing, and following Ariana Grande’s every move on social media.

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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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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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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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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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Paul Rueckhaus, MA, MPH

Recruitment Assistant

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Paul has been bouncing around the wonderful world of public health for 20 some years. He's been teaching public health, human sexuality and English at San Francisco State, City College of San Francisco and the San Mateo Community College District for the last 10 years. He's returning to his "harm reduction roots" at CSUH while he completes his associates degree in registered nursing at City College of San Francisco.

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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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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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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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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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Nimah Haq

Research Data Administrator

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Nimah received her Master of Public Health degree from the University of Southern California. She began working at CSUH soon after graduation. She would like to continue to work in public health and clinical research, more specifically in the biostatistics and epidemiology fields. Nimah loves to learn different languages and is fluent in Hindi and Urdu, and she is currently learning Spanish and Arabic.

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Margarita Martin, M.Sc, B.Pharm

Grants & Operations Manager

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Margarita is the Grants and Operations Manager at CSUH and she supports and performs complex grant administration for multiple branches within the Population Health Division at SFDPH. She received her Master of Science from the UCM in Pharmaceutical Sciences and her certificate in Clinical Trials from the San Francisco State University. Margarita speaks English, Spanish, French and Italian and loves soccer.

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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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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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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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Frank Lee
Research Associate
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Frank received his Bachelors in Microbial Biology from UC Berkeley before joining the CSUH team as a Research Associate for the HiNT and Harness studies. Frank may have been a fish in a past life, and enjoys snorkeling and diving in his hometown San Diego. Some other interests Frank has include language learning, dancing to 80s Japanese city pop or 90s R&B, and fishkeeping.

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Allie Dunham
Research Associate
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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.