- J. D. Vance is a former Marine, a Yale Law School grad and a principal at an investment firm in San Francisco
- Vance's memoir, "Hillbilly Elegy" describes growing up in poverty in Eastern Ohio
- His family struggled with teenage pregnancy, addiction and violence
- Memoir shines a light on the type of communities most supportive of Donald Trump
(CNN)Thirty-one-year-old J. D. Vance is a former Marine, a graduate of Yale Law School and now a principal at an investment firm in San Francisco. But he wasn't born into privilege. In his new memoir, "Hillbilly Elegy," Vance chronicles his childhood in a poor Rust Belt town in eastern Ohio, and, in turn, documents a culture in crisis.