He is a critic of evolutionary perspectives on psychology, and a critic of what he perceives to be the conventional psychiatric approach to schizophrenia. He has written on the subject of the problematic relationship between wealth and happiness, which is also the subject of his next book, Affluenza - How to be Middle Class, Successful and Fulfilled. Oliver James has been criticised in the past for writing in clinical terms on the mental health of celebrities and politicians., for blaming parents for their childrens' mental health problems, and for making criticisms of psychiatry that are based on factual errors, exemplified by his recent comment: "there is no evidence that the genetic material of schizophrenics differs in any way from people without the illness".