The approach has American proponents such as Alan Kazdin , former head of the American Psychological Association. "Seventy percent of the people in this country who need psychiatric services receive nothing," he says. That number comes from several studies, including two published in the Annual Review of Public Health and JAMA Internal Medicine . "The truth is that today, we are not treating everyone in need, and we cannot do so if we insist on one-to-one therapy, at a clinic, with a mental health professional." Kazdin is an expert on parenting but has been interested in lay counselors as a way of expanding access to care for years.