Dr. Jim Withers' office fits into a small backpack, which he carries with him every night on the streets of Pittsburgh. He and a small team of outreach workers and medical students are practicing what's called "street medicine" -- a term Dr. Withers coined in the early nineties. The idea behind street medicine is simple: a homeless person is not likely to visit a doctor when they're sick or a hospital when they're hurt, so the best way to get them treatment is to visit them where they live. On any given night Withers and his team are under bridges, on the steps of churches and in McDonald's bathrooms offering free check-ups, over-the-counter medications and treatments.
Withers works for a small non-profit called Operation Safety Net which is part of the Pittsburgh Mercy Health System. His collaborator is a former homeless man-turned-outreach-worker, Mike Sallows, who allowed Withers to tag along in his street patrols if he followed his rules -- Don't dress like a doctor, and don't do anything stupid. More than 20 years later, the two are still working together.