Homelessness has emerged as a significant and enduring social problem globally in developing and developed countries. With is aim of promoting social justice and influencing public policy, community psychology has much to offer in terms of addressing this problem. The presentation will focus on research and on research and knowledge mobilization efforts on homelessness in Canada of the keynote speaker that now spans over a decade. Specifically, findings from intervention and observational studies as well as knowledge dissemination products including a short video and report card on homelessness will be presented. Lessons learned from this work as a community psychologist will be discussed.