Michael O’Brien got out of his car one day in 1975 and sought the acquaintance of a man named John Madden who lived under an overpass. Their initial contact grew into a friendship that O’Brien chronicled for the Miami News, where he began his career as a staff photographer. O’Brien’s photo essays conveyed empathy for the homeless and the disenfranchised and won two Robert F. Kennedy Journalism Awards. In 2006, O’Brien reconnected with the issue of homelessness and learned the problem has grown exponentially since the 1970s, with as many as 3.5 million adults and children in America experiencing homelessness at some point in any given year.