1 Serena Rajabiun is with the Center for Innovation in Social Work & Health, Boston University School of Social Work, Boston, MA. Carole Hohl is with the Boston Health Care for the Homeless Program, Boston, MA. Mariana Sarango is with the Social Science Environmental Health Research Institute, Northeastern University, Boston, MA. At the time of writing, Jo Ann Whitlock Davich was with the Multnomah County Health Department, Portland, OR. Manisha H. Maskay is with Prism Health North Texas, Dallas. Melinda J. Tinsley is with the HIV/AIDS Bureau, Health Resources & Services Administration, Rockville, MD. Serena Rajabiun and Melinda J. Tinsley are also Guest Editors for this supplement issue.