Original: Laing 's views on the causes and treatment of serious mental dysfunction , greatly influenced by existential philosophy , ran counter to the psychiatric orthodoxy of the day by taking the expressed feelings of the individual patient or client as valid descriptions of lived experience rather than simply as symptoms of some separate or underlying disorder .
Simplified: Ronald David Laing ( born in the 7th of October of the 1927 in Glasgow ( Scotland ) and died in the 23rd of August of the 1989 ) , was a Scottish psychiatrist who described the mental illness , especially the psychosis .