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About the study

Our Mission

Real-time monitoring of the health, housing, and service needs of people experiencing unsheltered homelessness in Los Angeles County.

Our Purpose

The Periodic Assessment of Trajectories of Housing, Homelessness, and Health Study (PATHS) provides an innovative and adaptable platform for real-time monitoring of the health, housing, and service needs of people experiencing unsheltered homelessness in Los Angeles County. Through continuous, in-depth data collection via mobile phone surveys, PATHS offers valuable insights into the dynamic challenges faced by this population. By addressing critical gaps in longitudinal research, PATHS has the potential to drive more informed policy decisions and interventions that improve outcomes for this vulnerable population. Read our study's protocol paper to learn more about the PATHS study objectives, design, and methodology.

Our Methodology

  1. Recruit from a representative countywide frame

    A cohort of unsheltered individuals is recruited from Los Angeles County's Homeless Count Demographic Survey, an annual representative survey of the region's unsheltered population covering over 500 census tracts.

  2. Survey by phone, incentivise electronically

    A web-based survey platform and electronic gift card incentives support participation across screening, baseline, monthly, and biannual follow-up surveys.

  3. Ask carefully, about what matters

    Data on health, housing, and social outcomes is collected through trauma-informed, equity-sensitive surveys designed for diverse literacy levels, with a user-friendly interface and buffers around sensitive topics.

  4. Keep the instrument current

    Surveys are updated regularly to address emerging issues such as rehousing, policing, and healthcare changes affecting LA's unsheltered population.

Our Team

Ben Henwood

Ben Henwood

Principal Investigator

Benjamin Henwood, PhD, LCSW is the Albert G. and Frances Lomas Feldman Professor of Social Policy and Health at the University of Southern California (USC). He directs the Center for Homelessness, Housing and Health Equity Research at the USC Suzanne Dworak-Peck School of Social Work and also holds a secondary appointment as a professor in the USC Chan Division of Occupational Science and Occupational Therapy. Professor Henwood's research has been supported by the National Institutes of Health (i.e., NIMH, NIDA, NIA), the National Science Foundation, the Conrad N. Hilton Foundation, the Patient Centered Research Outcomes Institute and Google.org.

Randall Kuhn

Randall Kuhn

Principal Investigator

Dr. Randall Kuhn (Ph.D., University of Pennsylvania, 1999) is a demographer and sociologist focused on the social determinants of health among vulnerable populations. He is an expert in survey design, longitudinal analysis and counterfactual research design. Dr. Kuhn is a fellow of the California Center for Population Research, where he serves as Chair of the Executive Committee. He also serves on the advisory boards of the UCLA Center for the Study of International Migration and the Institute for Research on Labor and Employment. Kuhn previously chaired the Population Sciences Subcommittee of the Eunice Kennedy Shriver National Institute of Child Health and Human Development.

Jessie Chien

Jessie Chien

Research Manager

Jessie Chien, MHS, PhD, is the research manager for PATHS. Her research expertise focuses on examining the spatial context of health inequities for racialized and marginalized populations and uses both qualitative and quantitative methods, including geospatial techniques and longitudinal data analysis. She received her Master of Health Science at the Johns Hopkins Bloomberg School of Public Health and PhD from the UCLA Fielding School of Public Health.

Gisele Corletto

Gisele Corletto

Project Manager

Gisele Corletto, MSW is a Project Administrator and has extensive experience working with diverse populations throughout the Greater Los Angeles area, applying leadership, management, and clinical skills. She has successfully led multiple community initiatives and research projects focused on developing the best practices for underserved populations, including people experiencing homelessness and the military and veteran population in Los Angeles County.

Project co-Investigators

  • Evan Shannon
  • Benjamin Seligman
  • Amanda Landrian Gonzalez

Current Project Staff

  • Stacy Castellanos
  • Irene del Mastro N
  • Geoffrey Cui-Naudet
  • Gabrielle Arreglo
  • Sara Ozuna
  • Joyston Menezes
  • Scott Hickey
  • Saachi Pavani
  • Amber Freeman

Past Project Staff

  • Taylor Mobley
  • Danielle Paulazzo
  • Norma Guzman Hernandez
  • Erik Guadron
  • Alexander Lawton