Donald Addington is a professor in the Department of Psychiatry in the Cumming School of Medicine at the University of Calgary. He is also a member of the Mathison Centre for Mental Health Research and Education and the Hotchkiss Brain Institute. He has developed tools that have had a broad impact on the quality of health care delivery, including clinical practice guidelines, psychiatric status rating scales, fidelity scales, risk adjustment models, and performance measures. He is the author of Calgary Depression Scale for Schizophrenia, the internationally recognized gold standard for the assessment of depression in schizophrenia.