Suicide kills twice as many people as murder each year in the United States, and rates in the military recently surpassed those among civilians. But while scientists have identified some risk factors for suicide—being white, being male, substance abuse, mental illness—they still have little idea what spurs people to take their own lives.
Matthew Nock is a professor in the department of psychology at Harvard University in Cambridge, Massachusetts.
Jane Pearson is chair of the Suicide Research Consortium at the National Institute of Mental Health at the National Institutes of Health in Bethesda, Maryland.
Matthew Miller is an associate professor of health policy at the Harvard School of Public Health and co-director of the Harvard Injury Control Research Center in Boston, Massachusetts.