Serious mental disorders affect thinking, mood and behaviour. The consequences are suffering, impaired function in daily life and yearly costs estimated in Canada at tens of billions of dollars. Like diabetes, hypertension and asthma, mental disorders are complex disorders, meaning there is no single gene mutation, experience or environmental effect that can be held responsible. With a history of focused but isolated research strategies that have failed to address these complexities, present day treatments for schizophrenia and bipolar disorder are no more effective than those developed 50 years ago. There is also a lack of effective treatments for Alzheimer’s disease. The Centre for Complex Disorders (CCD) will seek integrative and transformative solutions to these health problems, with an initial focus on psychotic illnesses, such as bipolar disorder and some types of depression. These often begin in adolescence and cause those affected to lose contact with reality, and chronically become socially isolated and unable to work. The unit’s secondary focus will be complex disorders affecting memory in old age.