Dennis McCollins recounts some of the experiences that caused him to harden against the world as a teenager. “There were times I went to more funerals than birthdays,” says McCollins, who is the clinical director of the School Based Health Center at Greenwood Academy in Richmond, Calif. And it took its toll: “I spent time homeless. I got expelled [from school]. I was so angry and upset and mad,” he says. Dennis McCollins Then a man that he met when he was sent to Job Corps as a teen turned...