Homelessness in America's cities remains an intractable and growing problem. Challenges facing the homeless today the same as in years past: poverty, tenuous ties to family and friends or none, debilitating physical and mental health issues, and substance abuse. Compared to the 1950s-1970s, more homeless are sleeping on city streets versus in shelters or single room hotels. Homelessness rates are affected by economic trends, lack of affordable healthcare and housing, decline in public assistance programs and natural and man-made disasters. This collection of essays covers case studies, innovations, practices and policies of municipalities coping with homelessness in the 21st century.