David Habercom is emerging as one of this region's most prolific portrait photographers. But Habercom specializes in a different kind of portrait. In recent years, he's established a reputation for taking provocative, insightful photographs of homeless people. And his work has revealed a depth to homelessness that catches a lot of people off guard. WUOT's Matt Shafer Powell recently spent the day with Habercom at his Knoxville studio...