Ronald David Laing ( 7 October 1927 - 23 August 1989 ) , usually cited as R. D. Laing , was a Scottish psychiatrist who wrote extensively on mental illness - in particular , the experience of psychosis .
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 mental illness , especially psychosis .