Ask David Ross to describe an average day on the job. He says it doesn't exist. Ross is a violence intervention specialist at the University of Maryland Medical Center. Though he isn't a doctor, he's been working at the hospital as part of its Violence Prevention Program for close to 10 years. His team works with patients who are victims of violent injuries — stabbings, gunshots or physical assaults — and who physicians flag as candidates for the program's assistance. His challenge is to figure out the factors in their lives that put them at risk of violence.