The Johns Hopkins University School of Medicine and the Salk Institute for Biological Studies are leading a $15.4 million effort to develop new systems for quickly screening libraries of drugs for potential effectiveness against schizophrenia and bipolar disorder. The National Institute of Mental Health is funding the work. We spoke to Hongjun Song, professor of neurology and neurosciences at the Johns Hopkins University School of Medicine, about the effort, the challenges of understanding the underlying biological mechanism of these disorders, and how the consortium expects to change the development of drugs to treat mental illnesses.