Since 2001 over 1500 sets of skeletal remains of people crossing into the US from Mexico have been discovered in the Arizona's Sonoran Desert. In Left Behind, documentary photographer Jonathan Hollingsworth delivers a sobering look at those who do not survive the border crossing and examines the personal effects that they leave behind. He describes it as a way of humanizing the immigration issues faced in the USA by examining the desperation that drives people to risk their lives to start anew in America.